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Scientific Method

SCIENTIFIC METHOD

SCIENTIFIC METHOD. Methods for investigating the natural world were transformed in the early modern era, leading to a variety of approaches that emerged from diverse philosophical orientations. To call these diverse methodologies "scientific" is a convenience but one that entails anachronistic usage. The Latin word scientia, meaning, broadly, 'knowledge', has none of the methodological implications of the modern term science. Early modern investigators called themselves philosophers, natural philosophers, physicians, and experimental or mathematical philosophers rather than scientists. Methodological issues often were the focus of lively discussions and bitter disputes. By the end of the era, approaches to investigating the natural world had undergone profound changes that historians traditionally have called the "scientific revolution."

ARISTOTELIANISM

The predominant methodology inherited by early modern learned culture was Aristotelian. The writings of Aristotle became the basis of the medieval university curriculum and remained so well into the seventeenth century. For Aristotle, knowledge (epistēmē in Greek, scientia in Latin) was universal and necessary. The goal of natural philosophy was to grasp the principles and natures of natural substances and to understand their causes. The method was a logical one based on syllogistic reasoning. If A equals B and B equals C, then A equals C. The four Aristotelian causes comprised the material cause (what a thing is made of), the formal cause (what kind of thing it is), the efficient cause (what made it), and the final cause (its purpose or goal), this last being most important. Demonstration was a process whereby a syllogistic proof of an effect was constructed through an analysis of its causes.

In the mid-sixteenth century at the University of Padua, traditional Aristotelian logic began to provide a renewed methodological basis for investigating the natural world. The most important figure in this development was Jacopo Zabarella (15331598). Remaining within an Aristotelian framework, the new logic asked how investigators got from sense perception to demonstrable truth. They discussed "demonstrative regress, a logical technique permitting the scholar to reason from an observed effect (fact) to its proximate cause and then to reason back (regress) from the cause to the effect where the reasoning began" (Grendler, p. 263). These methodological explorations influenced Galileo and other investigators until the mid-seventeenth century when Aristotelianism itself declined in influence.

HUMANISM AND NEOPLATONISM

Without replacing Aristotelianism, new approaches developed in the fifteenth and sixteenth centuries that emphasized particulars. Humanism was a broad intellectual movement that engaged in the reform of Latin and the rediscovery of ancient texts. Humanists criticized the logical approach of Scholasticism and often focused upon individuals in specific times and places, utilizing the dialogue and letter as literary forms that allowed the expression of individual points of view. They also studied and edited ancient texts, many of which became significant for the investigation of the natural world.

Renaissance Neoplatonism emerged as a result of this humanist textual work. A key figure is Marsilio Ficino (14331499), who during the second half of the fifteenth century translated and edited the writings of Plato, Neoplatonic philosophers such as Plotinus (205270 c.e.), and the Hermetic corpus. The latter consisted of a group of writings actually dating from late antiquity that Ficino and his contemporaries believed were written before the time of Moses by one Hermes Trismegistus. They considered that the Hermetic corpus comprised a synopsis of ancient theology (prisca theologia). Ficino and his many successors in the sixteenth and seventeenth centuries believed in the reality of magic and in occult powers because they viewed the universe as a spiritual unity connected in all its various parts by sympathies and antipathies. The magus or magician could influence remote parts of the cosmos by manipulating these connections, and he or she did so to influence worldly matters, such as sickness and health. The operational aspects of Neoplatonic magical traditions may have influenced the development of experimentation, a methodology that entailed the active manipulation of the natural world.

Neoplatonic doctrines also influenced notions about experience and its role in investigating nature. One example entails the doctrine of signatures and illumination. In one version, that of the sixteenth-century physician Paracelsus (1493/941541), experience is framed by the biblical context of the Fall. Humans after their expulsion from paradise no longer had direct access to the Word of God or direct knowledge of the world of nature. Yet because God had put the light of nature (lumens naturalis) in them they could overcome their fallen state. The light of nature awakened in their minds, so they were able to see signs stamped on natural things. Directly experiencing such things, they could thereby see God's "signatures," which were external signs that pointed to the internal nature of things.

MEDICINE AND ALCHEMY

Within the discipline of medicine, interest in particulars and a validation of individual experience developed in a variety of ways. In the fourteenth century a branch of medicine known as practica emerged that concerned the particulars of disease and treatments. By the sixteenth century the writings of the ancient physician Galen (129c. 199 c.e.) had become widely influential, particularly with respect to his empirical orientation and his practice of dissecting animals. Human dissection was taken up as part of the medical curriculum in the late medieval universities. Initially dissections were carried out in formal, public settings in which a high-status, learned doctor stood on a podium to read an authoritative text on anatomy, while a low-status person performed the handwork of dissection. In his famous De Humani Corporis Fabrica (On the fabric of the human body) published in 1543, Andreas Vesalius (15141564) advocated hands-on dissection by the high-status physician as well as careful observation and the visual depiction of body parts. Vesalius criticized but was also indebted to Galen. His famous treatise is part of a rich tradition of anatomical study that continued through the eighteenth century. This tradition notably includes the experimental work of William Harvey (15781657) in the 1620s on the circulation of the blood.

Alchemy represents a distinct discipline that developed in early modern Europe after the medieval transmission of key texts from the Islamic world. Alchemists often undertook hands-on, laboratory operations entailing separations, distillations, and the like. In the seventeenth century alchemy and related fields developed genuine experimental procedures. Jean Baptiste van Helmont (15791644) carried out numerous careful determinations of specific weights of substances he produced in his laboratory. George Starkey (16271665) undertook thousands of experiments to discover a single method of changing all sulfurs into medicines. The laboratory experiments of Robert Boyle (16271691) were influenced by this work. Scholars have investigated these seventeenth-century developments in detail and have traced their influence on eighteenth-century chemists, such as Antoine Lavoisier (17431794). This scholarship has brought into question the traditional sharp distinction between early modern alchemy and modern chemistry.

MECHANICAL ARTS

The mechanical arts entailed skilled craft work, including carpentry and weaving, but also arts that are now considered fine arts, such as painting and sculpture. The influence of artisanal craft values on early modern scientific methodology has been a longstanding topic of discussion in the history of science. The Viennese scholar and refugee Edgar Zilsel (18911944) argued that artisanal values that appreciated hands-on experience and craft work influenced the emergence of an experimental methodology in the seventeenth century. Subsequent scholarship has shown that the fifteenth- and sixteenth-century proliferation of writings on mechanical arts transformed the practical knowledge of the crafts into discursive subjects worthy of the attention of learned persons. Painters and other practitioners wrote books in which they articulated the value of practice and direct experience as crucial for obtaining knowledge of the natural world.

MATHEMATICS AND MECHANICS

Practical problems in the mechanical arts increasingly came to be analyzed in mathematical terms. The ancient mathematician Archimedes (c. 287212 b.c.e.), who had applied geometric analysis to problems of statics (the science of weights), came to be highly influential. In the sixteenth century Niccolò Tartaglia (14991557) published the first Latin treatises of Archimedes and also wrote books in which he mathematically analyzed practical problems, such as the trajectory of cannonballs. Later in the same century authors, such as the nobleman and patron of Galileo, Guidobaldo del Monte (15451607), wrote treatises on machines and mechanics in the context of theory and mathematics.

This sixteenth-century tradition preceded the development of the new science of motion developed by Galileo Galilei (15641642). Galileo worked out the mathematical kinematics of motion. Disregarding air resistance, he concluded that all bodies fall in uniformly accelerated motion and that velocity increases in proportion to time elapsed. He went on to deduce the mathematical results of this conclusion, for instance, that the distance increases in proportion to the square of time. Following Galileo, Christiaan Huygens (16291695) worked out the mathematics of the pendulum and of circular motion. Near the end of the seventeenth century, in Philosophiae Naturalis Principia Mathematica (1687; Mathematical principles of natural philosophy), Isaac Newton (16421727) created a system of terrestrial and celestial dynamics in which he demonstrated mathematically a large array of propositions concerning natural phenomena. In these and many other examples in the seventeenth and eighteenth centuries, the aim of natural and experimental philosophers was to describe motion by means of mathematics. This project was possible because of simultaneous developments within mathematics itself, culminating in the invention of calculus by Newton and by Gottfried Wilhelm Leibniz (16461716) at the end of the seventeenth century.

INSTRUMENTATION AND EXPERIMENTATION

During the sixteenth and seventeenth centuries the use of instruments to measure and investigate the natural world came to be increasingly important. The Danish nobleman Tycho Brahe (15461601) is considered the greatest observational astronomer before the invention of the telescope. For twenty years, from his Uraniborg observatory, Brahe made systematic observations of the moon, the planets, and other phenomena, such as the comet of 1577. He used these observations not only to correct and improve available data but to investigate and develop theories about the nature of the heavens and the structure of the cosmos.

Observational astronomy changed with the invention of the telescope. With this new instrument Galileo made detailed observations of the moon and the stars of the Milky Way. He further discovered the four moons of Jupiter (the Medicean Stars). In The Sidereal Messenger (1610) he described these discoveries with both text and drawings. Galileo's conclusions were by no means instantly accepted. He had to persuade his contemporaries that his instrument produced valid data, not optical illusions. Like Brahe and others of his predecessors, Galileo produced new data, but he also used that data to make novel claims about the nature of the cosmos.

Instruments and devices became especially significant in the seventeenth and eighteenth centuries. Among these devises were "philosophical" machines especially devised to investigate the natural world. A prominent example of such a philosophical machine was the air pump, used by Boyle to investigate the nature of air. The pump was difficult to build and to use. Nevertheless, it was key to a whole series of experiments concerning air carried out in the mid-seventeenth century.

In seventeenth-century England the notion of the reliable witness to experiments emerged. Such a witness was an honorable person, preferably a gentleman (therefore immune from the self-interest of the artisan), who could attest to the accuracy of the stated results of a given experiment. Valid experimental results came to be tied to the social requirements of gentlemanly honor. By the eighteenth century, however, learned visitors interested in natural philosophy who came to London often visited the shops of instrument makers to purchase instruments but also to discuss philosophical and experimental issues. By this time the instrument maker's shop had become a space for philosophical discourse, while the status of certain kinds of craft practitioners had risen.

The use of instruments to investigate nature had important methodological implications because it challenged the notion of Aristotelian common experience. For Aristotelians common experience was valid because all reasonable people without question agreed that a particular claim was true. In contrast, truth derived from experimentation, and instrumentation depended on the manipulation of a device that was only available to particular individuals. Such individuals had to have access to the device itself and had to possess particular skills to use it. Aristotelian common experience and seventeenth-century experiment represented opposing methodologies. Further the use of instrumentation to investigate nature challenged the Aristotelian separation of the categories of technē (material production and reasoning about that production) and epistēmē (certain knowledge of unchanging truths).

BACONIAN EMPIRICISM AND NATURAL HISTORY

The English jurist and philosopher Francis Bacon (15611626) proposed a new methodology that aimed to bring about a continuous flow of new facts about the natural world. Bacon's most significant methodological work was Instauratio Magna (16201626; The great instauration), which included Novum Organum (1620; New instrument). Bacon rejected syllogistic logic, pointing out that the premises of the syllogism could be in error. His own method entailed gathering a large amount of data on a variety of subjects and applying that data to the development of axioms. His goal was to account for the many particular things in nature in all its diversity. Yet his method entailed more than the simple collection of sense experiences, for Bacon believed the senses could deceive. Rather, in the creation of axioms he took into account the "maker's knowledge," that is, the presuppositions necessary for the fabrication of a thing. To gather data, Bacon proposed a cooperative effort to write "histories of the trades," detailed accounts of the essential operations of productive arts, such as silk textiles, mining, printing, papermaking, and agriculture, as well as "natural histories" on topics such as snakes, birds, and metals.

In the sixteenth and seventeenth centuries, particularly in Italy, natural history was the focus of growing interest. The creation of natural history collections by naturalists, such as Ulisse Aldrovandi (15221605) and Athanasius Kircher (16011680), and the intense study of the specimens in those collections became an important aspect of the investigation of nature. Museums became "laboratories of nature" (Findlen, p. 154), where investigations entailing testing, dissection, and distillation occurred. In some instances the collection of specimens was accompanied by the creation of detailed drawings based on careful observations. Collecting specimens, examining them, and having them drawn or painted became important modalities for the study of nature. Federico Cesi (15851630) and other members of the Academy of the Lincei, a scientific society founded in 1603, were particularly active in this form of investigation of the flora and fauna of Italy.

DESCARTES AND THE MECHANICAL PHILOSOPHY

The methodological writings of René Descartes (15961650) laid the foundations for the "mechanical philosophy." Descartes's famous dictum "Cogito ergo sum" ('I think therefore I am') is the basis for his notion that mind is a thinking substance and is to be excluded from the physical world entirely. That world, composed of particles of matter, is characterized by extension. These particles move only by virtue of mechanical necessity. Their motions produce all the variety of natural phenomena. Descartes eliminated spiritual or mental qualities from the material world, leaving the thinking subject (the "I" of the cogito) as the discoverer of the clear and certain truths of nature. That natural world, characterized by extension, is ordered by mathematical relationships. For Descartes certain knowledge could be obtained by applying mathematical rules to the world of nature.

CONCLUSION

Investigations of the rich methodological cornucopia that characterizes the early modern period have been guided by several general principles. First, early modern thought is studied on its own terms, not according to the values of modern scientific methodology. Second, the wide-ranging connections of methodological thought to contemporaneous language and meaning on the one hand and to social and cultural conditions on the other are being explored in depth. Finally, studies have followed the sources, whatever that content might be. As a result, natural history has taken its place beside physics. The doctrine of signatures has been studied as thoroughly as the laws of planetary motion. Such contextual approaches have greatly expanded knowledge of early modern methodologies for investigating the natural world.

See also Alchemy ; Aldrovandi, Ulisse ; Astronomy ; Bacon, Francis ; Boyle, Robert ; Brahe, Tycho ; Descartes, René ; Galileo Galilei ; Harvey, William ; Helmont, Jean Baptiste van ; Hermeticism ; Huygens Family ; Kircher, Athanasius ; Leibniz, Gottfried Wilhelm ; Mathematics ; Natural History ; Nature ; Neoplatonism ; Newton, Isaac ; Paracelsus ; Scientific Revolution ; Vesalius, Andreas .

BIBLIOGRAPHY

Primary Sources

Aristotle. The Complete Works of Aristotle: The Revised Oxford Translation. Edited by Jonathan Barnes. 2 vols. Princeton, 1984.

Galilei, Galileo. Sidereus Nuncius; or, The Sidereal Messenger. Translated by Albert van Helden. Chicago, 1989. An English translation that reproduces all of Galileo's drawings. Contains an extensive and useful introduction and notes.

Newton, Isaac. The Principia: Mathematical Principles of Natural Philosophy. Translated by I. Bernard Cohen and Anne Whitman. Berkeley and Los Angeles, 1999. Translation of Principia, 3rd ed. (1726). The translation to use. Contains an extensive and useful guide by Cohen.

Secondary Sources

Applebaum, Wilbur, ed. Encyclopedia of the Scientific Revolution: From Copernicus to Newton. New York, 2000.

Bennett, James A. "Shopping for Instruments in Paris and London." In Merchants and Marvels: Commerce, Science, and Art in Early Modern Europe, edited by Pamela H. Smith and Paula Findlen, pp. 370395. New York, 2002.

Bono, James J. The Word of God and the Languages of Man: Interpreting Nature in Early Modern Science and Medicine. Vol. 1, Ficino to Descartes. Madison, Wis., 1995.

Dear, Peter. Discipline and Experience: The Mathematical Way in the Scientific Revolution. Chicago, 1995.

Des Chene, Dennis. Spirits and Clocks: Machine and Organism in Descartes. Ithaca, 2001.

Findlen, Paula. Possessing Nature: Museums, Collecting, and Scientific Culture in Early Modern Italy. Berkeley and Los Angeles, 1994.

Freedberg, David. The Eye of the Lynx: Galileo, His Friends, and the Beginnings of Modern Natural History. Chicago, 2002.

Grant, Edward. The Foundations of Modern Science in the Middle Ages: Their Religious, Institutional, and Intellectual Contexts. Cambridge, U.K., 1996.

Grendler, Paul F. The Universities of the Italian Renaissance. Baltimore, 2002.

Lindberg, David C., and Robert S. Westman, eds. Reappraisals of the Scientific Revolution. Cambridge, U.K., 1990.

Long, Pamela O. Openness, Secrecy, Authorship: Technical Arts and the Culture of Knowledge from Antiquity to the Renaissance. Baltimore, 2001.

Newman, William R., and Lawrence M. Principe. Alchemy Tried in the Fire: Starkey, Boyle, and the Fate of Helmontian Chymistry. Chicago, 2002.

Pérez-Ramos, Antonio. Francis Bacon's Idea of Science and the Maker's Knowledge Tradition. Oxford, 1988.

Shapin, Steven, and Simon Schaffer. Leviathan and the Air-Pump: Hobbes, Boyle, and the Experimental Life. Princeton, 1985.

Siraisi, Nancy G. Medieval and Early Renaissance Medicine: An Introduction to Knowledge and Practice. Chicago, 1990.

Wallace, William A. Galileo's Logic of Discovery and Proof: The Background, Content, and Use of His Appropriated Treatises on Aristotle's Posterior Analytics. Dordrecht, 1992.

Pamela O. Long

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Scientific Method

Scientific Method

BIBLIOGRAPHY

Research is scientific if and only if it follows a procedure known as scientific method. A received view of this method has evolved in the seventeenth century as a synthesis of ideas of Bacon, Boyle, and Newton. Roughly, scientific method consists of indiscriminate observations of regularities, gathering information on repeatable phenomena, and using it as a sound basis for theorizing. Scientific method is, then, a talisman for success. Accordingly, researchers strive to show that their work conforms to scientific methodto the point of distortion. Yet, famously, all guarantees of success in research are worthless. Plato declared that the validity of ideas depends on their pedigree. Tradition offers only two views on the source of ideas: It is intuitionintellectualism, apriorism (Plato) or it is observationempiricism, inductivism (Aristotle). Question: Where should thinking or observing begin? No answer. Reliance on both thought and experience as sources of knowledge is impossible, as they may mismatch; yet their judicious use as procedures is possible: Apriorism admits experience as hints; inductivism admits hypotheses as temporary scaffolding.

The promise of success that scientific method grants depends on the unlearning of prejudices. Sir Francis Bacon, the father of the modern scientific method and a precursor of the Enlightenment, was the first to realize that preconceived opinions distort observation, as they invariably confirm themselves; reliable observations come from unbiased minds. So he recommended relinquishing all preconceptions. This is radicalism; it bespeaks utter rationality. The classical rationalists of the Age of Reason viewed humans as utterly rational, with reason as free of local (individual) differences. Their theories ignored these differences; their economic theory concerned only free trade; their political theory deemed the state as taking care of the contracts, including those between ruler and subject; religion they viewed as private, independent of any established church. Social researchers thus viewed individual conduct as purely rational and as yielding to individually endorsed motives exclusively. Thus, their views on scientific method embody a view of humanity as rational and the individual as preceding society.

The received view of scientific method remained excessively rationalist, radical, ahistorical, individualist, and liberal. To date it dominates the natural sciences, economics, and behaviorist and Freudian psychology. After the failure of the French Revolution, the dominant view within social studies had history as its paradigm, and its agenda largely aimed at shunning radicalism by presenting political theory historically, deprecating democracy and science. As views on scientific method differed, so views differed as to whether social studies start with individuals and reach the study of the social whole or vice versa. This was then a backlash against radicalism. Its prime initiator was Georg Friedrich Wilhelm Hegel, who traced the roots of French revolutionary terror to the Enlightenments dismissal of social authority as resting on prejudice. Scientific method is inapplicable to society, he declared, since societies have historical roots; there is no social prediction even though nations are subject to historical laws. Schelling, Hegel, and others, developed new methods, variants of which some twentieth-century thinkers embraced, especially Henri Bergson and Edmund Husserl. Following Hegels claim that the methods of the natural and social sciences diverge, Wilhelm Dilthey suggested that whereas the natural sciences employ deductive explanations, the social sciences employ empathy. (Karl Popper endorsed this distinction, incidentally: His theory of explanationsituational logicencompasses both models, and allows for reference to both individuals and institutions.) Hegels methodology is still popular among those who ignore scientific method. Conspicuous among his twentieth-century followers are Gabriel Marcel, Paul Ricouer, Martin Heidegger, Hans-Georg Gadamer, Jean-Paul Sartre, and Jacque Derrida. They all adopted variants of Husserls method. Heidegger preferred poetic truth to scientific truth. Gadamer endorsed Hegels objection to the Enlightenment movements sweeping dismissal of prejudice. He recommended the study of texts, not of facts, hoping that certitude is achievable there, with wider conclusions. Derrida objected: There is no one certain way to read a text. Gadamer was adamant, expressing preference for Aristotles text on physics over modern ones. Sartre first accepted scientific method and endorsed behaviorism. As he was later impressed with psychoanalysis, he gave up both. (Incidentally, Popper considered both violations of the rules of scientific method, as he rejected the received view.)

Hegel also influenced adherents to science, including Henri de St. Simon, Auguste Comte, John Stuart Mill, and Karl Marx. They sought the scientific historical laws that permit predictions. Marx stressed that scientific method sanctify his predictions, rendering them incontestable. (Not all his followers share his respect for science.) Does the use of scientific method validate Comtes theory of the three stages of history or Marxs view of history as propelled by the class struggle? Is dissent a challenge to their scientific credentials? Or did prejudice distort their use of scientific method? These are difficult questions.

William Whewell, a significant nineteenth-century transitional figure, dismissed the fear of prejudice. He contested Bacons proposal to empty our minds of preconceived opinions, declaring all ideas preconceived. He trusted rigorous tests to eliminate error. Bacon promised that empty minds will follow scientific method and produce true theories; Whewell denied that: We need hypotheses; occasionally, researchers hit upon true ones and verify them empirically, he said. His view won popularity among physicists while social thinkers followed Mill.

Marx challenged the individualist, ahistorical economics with his historical prediction: As markets must be increasingly unstable, capitalism will give way to socialismprobably through civil war. At the end of the nineteenth century, Émile Durkheim and Max Weber, known as the fathers of modern sociology, circumvented him and shifted the debate away from history back to the other question that Hegel had raised: Which is primary, the individual or the social whole? Their writings on society and on scientific method ignore historical laws.

Durkheims starting point was the claim that some social facts are observable (such as conformity to laws). This is hard to comprehend, but clearly, he wanted to broaden classical individualist methodology to make it recognize collective entities. He steered between Hegels view of social forces and Marxs view of economic forces. He considered national cultures to be the glue that maintains collectives; in particular, religion is societys representation or celebration of itself.

Durkheim valued individual contributions to culture, as he admired science. Does his view of culture allow for this? He left this question open. Hence, as a response to Hegel, his theory is incomplete. His attention lay elsewhere: He insisted that a culture coheres with its society. He invented functionalism, the view that social wholes are coherent. A clear counterexample to this is crime: It is dysfunctional. He suggested that crime has a function: to remind society of the law. This does not block the counterexample: The need for violent reminders bespeaks incoherence. Once functionalism incorporates dysfunctional aspects, it becomes trivial and abandons coherence. Durkheim was inspired by Claude Bernards observation that cold-blooded animals are more adapted to the environment but less energetic than warm-blooded ones. He applied this to the division of labor: High specialization enables a striking worker to bring society to a halt and forces it to cohere (organic solidarity). This is too vague to be open to criticism.

Weber rejected one-sided materialismin allusion to Marxand ascribed social values to ideas. His studies identify typical value-systems of typical members of various classes and societies. Unlike classical individuals who represent humanity in general, Webers typical individuals represent subcollectives. His theory of scientific method thus steers between classical individualism and collectivism. To emphasize his reluctance to say whether societies are real, he called it individualism of method.

Georg Simmel (a contemporary of Durkheim and Weber, but influential only after World War II) suggested that individual and society are equally primary, so that conflict is never totally avoidable. Karl Popper suggested considered action as strictly individual but within social contextssituational logicthus achieving a view that is in the traditional individualist mode, without being radical. This opens the road for new kinds of explanationespecially for actions aiming at institutional reform.

Poppers suggestion rests on his groundbreaking description of scientific theory as (not proven but) testable, namely, refutable. For success, this is necessary but insufficient: There is no guarantee. Scientific truth is then not the truth, but the best available approximation to it. This closes the debate comparing the rules for natural and social studies. For explanations in the social sciences to be refutable, they should center on individual actions. Science is now increasingly seen as the search for answers to interesting questions that are open to criticism.

Another development is of the systemist outlook: Both individual and society are systems of sorts (Mario Bunge). How is action at all possible? This question is outside the domain of social studies; these take actions as given and center on their unintended consequences (Hayek)especially actions intended to improve society. Systemism is incomplete without a theory of scientific method. Some variant of Poppers theory is an obvious candidate. This, however, is a matter for future discussions of scientific method adequate for social studies. The starting point of any such study has to be an examination of the history and sociology of the social sciences, especially of the question, what do we owe to the diverse school of thought of the past and to their august members?

SEE ALSO Positivism

BIBLIOGRAPHY

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Agassi, Joseph, and Ian C. Jarvie, eds. 1987. Rationality: The Critical View. Dordrecht, Netherlands: Kluwer.

Aron, Raymond. 1967. Durkheim, Pareto, Weber. Vol. 2 of Main Currents in Sociological Thought. Trans. Richard Howard and Helen Weaver. Garden City, NY: Doubleday.

Bacon, Sir Francis. 1620. The Collected Works of Francis Bacon, Volume I Part I, Philosophical Works. London: Routledge, [1879] 1996.

Bendix, Reinhardt. 1970. Embattled Reason: Essays on Social Knowledge. New Brunswick, NJ: Transaction Books.

Bochenski, Joseph M. 1957. Contemporary European Philosophy. Trans. Donald Nicholl and Karl Aschenbrenner. Berkeley: University of California Press.

Boyle, Robert. 1661. Proëmial Essay to Certain Physiological Essays. In The Works of Robert Boyle. Vol. 2, eds. Michael Hunter and Edward B. Davis. London: Pickering & Chatto, 19992000.

Bunge, Mario. 1996. Finding Philosophy in Social Science. New Haven, CT: Yale University Press.

Durkheim, Émile. 1893. Émile Durkheim on the Division of Labor in Society. Trans. Louis Coser. New York: Macmillan, 1933.

Durkheim, Émile. 1895. The Rules of Sociological Method. Trans. Sarah A. Solovay and John H. Mueller. Chicago: University of Chicago Press, 1938.

Durkheim, Émile. 1912. The Elementary Forms of the Religious Life. Trans. Joseph Ward Swain. London: George Allen & Unwin, 1915.

Durkheim, Émile. 1928. Socialism and Saint-Simon, ed. Alvin W. Gouldner; trans. Charlotte Sattler. Yellow Springs, OH: Antioch Press, 1958.

Durkheim, Émile, and Marcel Mauss. 1903. Primitive Classification. Trans. Rodney Needham. Chicago: University of Chicago Press, 1963.

Hayek, Friedrich von. 1952. The Counter-Revolution of Science: Studies on the Abuse of Reason. New York: Free Press.

Hegel, Georg Friedrich Wilhelm. 1837. Philosophy of History, ed. Eduard Gans; trans. John Sibree. New York: Dover, 1956.

Marx, Karl. 1849. Wage-Labor and Capital, ed. Friedrich Engels; trans. J. L. Joynes. Chicago: C. H. Kerr, 1891.

Marx, Karl. 1859. A Contribution to the Critique of Political Economy. Trans. N. I. Stone. Chicago: C. H. Kerr, 1904.

Marx, Karl. 1865. Wages, Price, and Profit. Moscow: Foreign Languages Publishing House, 1951.

Marx, Karl, and Friedrich Engels. 1848. The Communist Manifesto. Trans. Samuel Moore. New York and London: Verso, 1998.

Mill, John Stuart. 1843. A System of Logic, ed. J. M. Robson. London: Routledge & Kegan Paul, 1974.

Newton, Isaac. 1730. Query 31. In his Opticks, 4th ed. (London 1730) New York: Dover, 1952.

Pickering, William S. F., ed. 1975. Durkheim on Religion: A Selection of Readings with Bibliographies. London: Routledge.

Popper, Karl. 1935. The Logic of Scientific Discovery. London: Hutchinson, 1959.

Popper, Karl. 19421943. The Poverty of Historicism. London: Routledge, 1957.

Popper, Karl. 1945. The High Tide of Prophesy: Hegel, Marx, and the Aftermath. Vol. 2 of The Open Society and Its Enemies. London: Routledge.

Simmel, Georg. 1950. The Sociology of Georg Simmel, ed. and trans. Kurt H. Wolff. Columbus: Ohio State University Press.

Weber, Max. 19031917. The Methodology of the Social Sciences, eds. and trans. Edward A. Shils and Henry A. Finch. New York: Free Press, 1949.

Weber, Max. 19041905. The Protestant Ethic and the Spirit of Capitalism. Trans. Talcott Parsons. New York: Scribner, 1930.

Whewell, William. 1847. Philosophy of the Inductive Sciences. 2nd ed. 2 vols. New York: Johnson Reprint, 1967.

Joseph Agassi

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Scientific Method

Scientific method

Scientific thought aims to make correct predictions about events in nature. Although the predictive nature of scientific thought may not at first always be apparent, a little reflection usually reveals the predictive nature of any scientific activity. Just as the engineer who designs a bridge ensures that it will withstand the forces of nature, so the scientist considers the ability of any new scientific model to hold up under scientific scrutiny as new scientific data become available.

It is often said that the scientist attempts to understand nature. Ultimately, understanding something means being able to predict its behavior. Scientists, therefore, usually agree that events are not understandable unless they are predictable. Although the word "science" describes many activities, the notion of prediction or predictability is always implied when the word is used.

Until the seventeenth century, scientific prediction simply amounted to observing the changing events of the world, noting any regularities, and making predictions based upon those regularities. The Irish philosopher and bishop George Berkeley (16851753) was the first to rethink this notion of predictability.

Berkeley noted that each person experiences directly only the signals of his or her five senses. An individual can infer that a natural world exists as the source of his sensations, but he or she can never know the natural world directly. One can only know it through one's senses. In everyday life, people tend to forget that their knowledge of the external world comes to them through their five senses.

The physicists of the nineteenth century described the atom as though they could see it directly. Their descriptions changed constantly as new data arrived, and these physicists had to remind themselves that they were only working with a mental picture built with fragmentary information.

In 1913, Niels Bohr used the term model for his published description of the hydrogen atom. This term is now used to characterize theories developed long before Bohr's time. Essentially, a model implies some correspondence between the model itself and its object. A single correspondence is often enough to provide a very useful model, but it should never be forgotten that the intent of creating the model is to make predictions.

There are many types of models. A conceptual model refers to a mental picture of a model that is introspectively present when one thinks about it. A geometrical model refers to diagrams or drawings that are used to describe a model. A mathematical model refers to equations or other relationships that provide quantitative predictions.

New models are not constructed from observations of facts and previous models; they are postulated. That is to say, the statements that describe a model are assumed and predictions are made from them. The predictions are checked against the measurements or observations of actual events in nature. If the predictions prove accurate, the model is said to be validated. If the predictions fail, the model is discarded or adjusted until it can make accurate predictions.

The formulation of the scientific model is subject to no limitations in technique; the scientist is at liberty to use any method he can come up with, conscious or unconscious, to develop a model. Validation of the model, however, follows a single, recurrent pattern. Note that this pattern does not constitute a method for making new discoveries in science; rather it provides a way of validating new models after they have been postulated. This method is called the scientific method.

The scientific method 1) postulates a model consistent with existing experimental observations; 2) checks the predictions of this model against further observations or measurements; 3) adjusts or discards the model to agree with new observations or measurements.

The third step leads back to the second, so, in principle, the process continues without end. (Such a process is said to be recursive.) No assumptions are made about the reality of the model. The model that ultimately prevails may be the simplest, most convenient, or most satisfying model; but it will certainly be the one that best explains those problems that scientists have come to regard as most acute.

Paradigms are models that are unprecedented to attract an enduring group of adherents away from competing scientific models. A paradigm must be sufficiently open-ended to leave many problems for its adherents to solve. The paradigm is thus a theory from which springs a coherent tradition of scientific research. Examples of such traditions include Ptolemaic astronomy , Copernican astronomy, Aristotelian dynamics, Newtonian dynamics, etc.

To be accepted as a paradigm, a model must be better than its competitors, but it need not and cannot explain all the facts with which it is confronted. Paradigms acquire status because they are more successful than their competitors in solving a few problems that scientists have come to regard as acute. Normal science consists of extending the knowledge of those facts that are key to understanding the paradigm, and in further articulating the paradigm itself.

Scientific thought should in principle be cumulative; a new model should be capable of explaining everything the old model did. In some sense, the old model may appear to be a special case of the new model.

The descriptive phase of normal science involves the acquisition of experimental data. Much of science involves classification of these facts. Classification systems constitute abstract models, and it is often the case that examples are found that do not precisely fit in classification schemes. Whether these anomalies warrant reconstruction of the classification system depends on the consensus of the scientists involved.

Predictions that do not include numbers are called qualitative predictions. Only qualitative predictions can be made from qualitative observations. Predictions that include numbers are called quantitative predictions. Quantitative predictions are often expressed in terms of probabilities, and may contain estimates of the accuracy of the prediction.

The Greeks constructed a model in which the stars were lights fastened to the inside of a large, hollow sphere (the sky), and the sphere rotated about the earth as a center. This model predicts that all of the stars will remain fixed in position relative to each other. However, certain bright stars were found to wander about the sky. These stars were called planets (from the Greek word for wanderer). The model had to be modified to account for motion of the planets. In Ptolemy's a.d.100170) model of the solar system , each planet moves in a small circular orbit, and the center of the small circle moves in a large circle around the earth as center.

Copernicus (14731543) assumed the Sun was near the center of a system of circular orbits in which the earth and planets moved with fair regularity. Like many new scientific ideas, Copernicus' idea was initially greeted as nonsense, but over time, it eventually took hold. One of the factors that led astronomers to accept Copernicus' model was that Ptolemaic astronomy could not explain a number of astronomical discoveries.

In the case of Copernicus, the problems of calendar design and astrology evoked questions among contemporary scientists. In fact, Copernicus's theory did not lead directly to any improvement in the calendar. Copernicus's theory suggested that the planets should be like the earth, that Venus should show phases, and that the universe should be vastly larger than previously supposed. Sixty years after Copernicus's death, when the telescope suddenly displayed mountains on the moon , the phases of Venus, and an immense number of previously unsuspected stars, the new theory received a great many converts, particularly from non-astronomers.

The change from the Ptolemaic model to the Copernican model is a particularly famous case of a paradigm change. As the Ptolemaic system evolved between 200 b.c. and 200 a.d., it eventually became highly successful in predicting changing positions of the stars and planets. No other ancient system had performed as well. In fact, the Ptolemaic astronomy is still used today as an engineering approximation. Ptolemy's predictions for the planets were as good as Copernicus's predictions. With respect to planetary position and precession of the equinoxes, however, the predictions made with Ptolemy's model were not quite consistent with the best available observations. Given a particular inconsistency, astronomers for many centuries were satisfied to make minor adjustments in the Ptolemaic model to account for it. Eventually, it became apparent that the web of complexity resulting from the minor adjustments was increasing more rapidly than the accuracy, and a discrepancy corrected in one place was likely to show up in another place.

Tycho Brahe (15461601) made a lifelong study of the planets. In the course of doing so, he acquired the data needed to demonstrate certain shortcomings in Copernicus's model. But it was left to Johannes Kepler (15711630), using Brahe's data after the latter's death, to come up with a set of laws consistent with the data. It is worth noting that the quantitative superiority of Kepler's astronomical tables to those computed from the Ptolemaic theory was a major factor in the conversion of many astronomers to the Copernican theory.

In fact, simple quantitative telescopic observations indicate that the planets do not quite obey Kepler's laws, and Isaac Newton (16421727) proposed a theory that shows why they should not. To redefine Kepler's laws, Newton had to neglect all gravitational attraction except that between individual planets and the sun. Since planets also attract each other, only approximate agreement between Kepler's laws and telescopic observation could be expected.

Newton thus generalized Kepler's laws in the sense that they could now describe the motion of any object moving in any sort of path. It is now known that objects moving almost as fast as the speed of light require a modification of Newton's laws, but such objects were unknown in Newton's day.

Newton's first law says that a body at rest remains at rest unless acted upon by an external force. His second law states quantitatively what happens when a force is applied to an object. The third law states that if a body A exerts a force F on body B, then body B exerts on body A a force that is equal in magnitude but opposite in direction to force F. Newton's fourth law is his law of gravitational attraction.

Newton's success in predicting quantitative astronomical observations was probably the single most important factor leading to acceptance of his theory over more reasonable but uniformly qualitative competitors.

It is often pointed out that Newton's model includes Kepler's laws as a special case. This permits scientists to say they understand Kepler's model as a special case of Newton's model. But when one considers the case of Newton's laws and relativistic theory, the special case argument does not hold up. Newton's laws can only be derived from Albert Einstein's (18761955) relativistic theory if the laws are reinterpreted in a way that would have only been possible after Einstein's work.

The variables and parameters that in Einstein's theory represent spatial position, time, mass, etc. appear in Newton's theory, and there still represent space , time, and mass. But the physical natures of the Einsteinian concepts differ from those of the Newtonian model. In Newtonian theory, mass is conserved; in Einstein's theory, mass is convertible with energy. The two ideas converge only at low velocities, but even then they are not exactly the same.

Scientific theories are often felt to be better than their predecessors because they are better instruments for solving puzzles and problems, but also for their superior abilities to represent what nature is really like. In this sense, it is often felt that successive theories come ever closer to representing truth, or what is "really there." Thomas Kuhn, the historian of science whose writings include the seminal book The Structure of Scientific Revolution (1962), found this idea implausible. He pointed out that although Newton's mechanics improve on Ptolemy's mechanics, and Einstein's mechanics improve on Newton's as instruments for puzzle solving, there does not appear to be any coherent direction of development. In some important respects, Professor Kuhn has argued, Einstein's general theory of relativity is closer to early Greek ideas than relativistic or ancient Greek ideas are to Newton's.

See also Historical geology; History of exploration I (Ancient and classical); History of exploration II (Age of exploration); History of exploration III (Modern era)

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Scientific Method

Scientific method

The term scientific method refers in general to the procedures that scientists follow in obtaining true statements about the natural world. As it happens, scientists actually use all manner of procedures to obtain the information they want. Some of those procedures are not very objective, not very formal, and not very systematic. Still, the "ground rules" by which science tends to operate are distinctive and very different from those by which "true statements" are produced in philosophy, the arts, history, ethics, and other fields of human endeavor.

"The scientific method"

Many science textbooks begin with an exposition of a system of thought that, at least in the ideal, describes the way scientists work. The system is actually a cyclical process, one in which it is impossible to say where the whole process begins.

Certainly one element in the process is the recognition of a problem or the desire to know something specific about the natural world. For example, one might wonder whether an airplane flies better with narrow wings or broad wings. In most cases, a scientist poses a question such as this in terms of a hypothesis. A hypothesis is an idea phrased in the form of a statement that can be tested by observation and/or experimentation. In this example, the hypothesis might be: "Airplanes with broad wings fly better than airplanes with narrow wings."

The next step in the procedure is to devise ways of testing that hypothesis. In some cases, one can simply go out into the real world and collect observations that will confirm or deny the hypothesis. In most cases, however, a scientist will design one or more experiments to test the hypothesis. An experiment is really nothing more than a set of procedures designed to test a given hypothesis. Experiments are generally more productive than observations in the natural world because they deal with only one specific aspect of the whole world. Confusing factors can be intentionally omitted in order to concentrate on the one factor in which the scientist is interested.

In the case of airplane wings, one approach would be to design a series of airplanes, each with wings somewhat broader than the others. Each plane could be flown, and the efficiency of its flight noted.

Words to Know

Experiment: A controlled observation.

Fact: A statement that is widely accepted as being true by scientists.

Hypothesis: An idea phrased in the form of a statement that can be tested by observation and/or experiment.

Scientific law: A statement that brings together and shows the relationship of many scientific facts.

Scientific theory: A statement that brings together and shows the relationship of many scientific laws; also, but less commonly, another term for hypothesis.

The results of observations and/or experiments permit scientists to draw conclusions about the hypothesis. In our example, a scientist might discover that airplanes with broad wings fly better or not as well as airplanes with narrow wings. Or the results of experimentation may indicate that flying efficiency seems unconnected to wing width.

Imagine that a scientist, however, discovers that every broad-winged airplane flies better than every narrow-winged plane tested. Can it then be said that the original hypothesis has been confirmed?

Probably not. One critical aspect of science is that no hypothesis is regarded as true until it has been tested and re-tested many times. If two dozen scientists all perform the same experiment and get the same result, then confidence in the truth of that result grows. After a long period of testing, a hypothesis may begin to take on the form of a fact. A fact is a statement that is widely accepted as being true by scientists.

Interestingly enough, it is never possible in science to prove a statement true for all time. The best one can hope for is that a fact is not proved wrong. That is, maybe the one-hundred-first time a fact/hypothesis is tested, it is found to be incorrect. That single instance does not necessarily prove the fact/hypothesis wrong, but it does raise questions. If additional "false" results are obtained, the hypothesis is likely to be rejected as "not true."

The cycle of the scientific method is completed when a new fact has been learned. In most cases, that new fact will suggest new questions, new hypotheses in the minds of scientists. For example, if broad-winged airplanes do fly more efficiently than narrow-wing airplanes, then what is the effect of making the wings fatter or thinner? As soon as that question (or one like it) occurs to someone, the cycle of hypothesizing, testing, and concluding begins all over again.

Laws and theories

Obviously, untold numbers of facts exist in science. The process of learning a new science is, to a large extent, learning the facts that make up that science.

But individual facts in and of themselves are not very useful in science. Their greater importance lies in the variety of ways in which they can be combined to make more general statements about nature. For example, it might be possible to make a factual statement about the boiling point of ethyl alcohol, a second factual statement about the boiling point of propyl alcohol, a third factual statement about the boiling point of butyl alcohol, and so on. But what is of greater interest to scientists is some general statement about the boiling points of all alcohols in general. General statements that bring together many, many related facts are known as scientific laws.

Scientific laws, like individual facts, often suggest new questions, new hypotheses, new experiments, and, eventually, new facts. These facts tend to make scientists more confident about the truth of a law or, in some cases, raise questions as to the law's correctness.

One more step of generalization exists in science: scientific theories. A great deal of confusion centers on the word "theory" in science. Most people use the word theory to suggest a guess about something: "I have a theory as to who stole that money." Scientists sometimes use the word in the same sense.

But theory can mean something quite different in science. A scientific theory is a system of generalization even larger and more comprehensive than a scientific law. Just as a law is a collection of facts, so a scientific theory is a collection of scientific laws.

This definition explains the misunderstanding that some nonscientists have about the use of the word theory. Some people may believe that the theory of evolution is only a guess, as the term is used in everyday life. But the word theory is not used in that sense here. The theory of evolution refers to a massive system that brings together many, many laws that describe the way organisms change over time. Biologists are not guessing that these laws are true; they are supremely confident that they are, in fact, true.

What science can and cannot do

The scientific method has been a powerful tool for learning a great deal about the physical world, but it is not a system for answering all questions. The only questions science can attack are those that can be answered by using the five human senses in one way or another. For example, suppose that someone hypothesizes that the reason earthquakes occur is that tiny invisible demons living under Earth's surface cause those events. That hypothesis is, by definition, untestable by scientific methods. If the demons are invisible, there is no way for scientists to observe them. One might look for indirect evidence of the demons' existence, but the problem is probably beyond scientific investigation.

It is for this reason that topics such as love, hope, courage, ambition, patriotism, and other emotions and feelings are probably beyond the scope of scientific research. That statement does not mean these topics are not worth studyingjust that the scientific method is not likely to produce useful results.

Another question that the scientific method cannot solve is "why?" That statement may startle readers because most people think that explaining why things happen is at the core of scientific research.

But saying why something happens suggests that we know what is in the mind of someone or something that makes events occur as they do. A long time ago, scientists decided that such questions could not be part of the scientific enterprise. We can describe how the Sun rises, how objects fall, how baseballs travel through the air, and so on. But science will never be able to explain why these things occur as they do.

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Scientific Method

Scientific method

An approach to research that relies on observation and data collection, hypothesis testing, and the falsifiability of ideas.

The scientific method involves a wide array of approaches and is better seen as an overall perspective rather than a single, specific method. The scientific method that has been adopted was initially based on the concept of positivism, which involved the search for general descriptive laws that could be used to predict natural phenomena. Once predictions were possible, scientists could attempt to control the occurrence of those phenomena. Subsequently, scientists developed underlying explanations and theories. In the case of psychology, the goal would be to describe, to predict, then to control behavior, with knowledge based on underlying theory.

Although the positivist approach to science has undergone change and scientists are continually redefining the philosophy of science, the premises on which it was based continue to be the mainstream of current research. One of the prime requisites of a scientific approach is falsifiability; that is, a theory is seen as scientific if it makes predictions that can be demonstrated as true or false. Another critical element of the scientific method is that it relies on empiricism , that is, observation and data collection.

Research often involves the hypothetico-inductive method. The scientist starts with a hypothesis based on observation, insight, or theory. A hypothesis is a tentative statement of belief based on the expert judgment of the researcher. This hypothesis must be subject to falsification; that is, the research needs to be set up in such a way that the scientist is able to conclude logically either that the hypothesis is correct or incorrect. In many cases, a research project may allow the scientist to accept or reject a hypothesis and will lead to more research questions.

Psychologists employ a diversity of scientific approaches. These include controlled experiments that allow the researcher to determine cause and effect relationships; correlation methods that reveal predictable relations among variables; case studies involving in-depth study of single individuals; archival approaches that make novel use of records, documents, and other existing information; and surveys and questionnaires about opinions and attitudes.

Because the scientific method deals with the approach to research rather than the content of the research, disciplines are not regarded as scientific because of their content, but rather because of their reliance on data and observation, hypothesis testing , and the falsifiability of their ideas. Thus, scientific research legitimately includes the study of attitudes, intelligence , and other complicated human behaviors. Although the tools that psychologists use to measure human behavior may not lead to the same degree of precision as those in some other sciences, it is not the precision that determines the scientific status of a discipline, but rather the means by which ideas are generated and tested.

See also Research method.

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Scientific Method

Scientific Method

See Models; Science and Religion, Models and Relations; Science and Religion, Methodologies; Science and Religion, Research in; Scientism

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scientific method

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