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cohesion

cohesion (functional cohesion) A measure of the degree to which parts of a program module are closely functionally related. High cohesion means that each part is directed toward and essential for that module to perform its required function, and that the module performs only that function. Low cohesion might be due to convenience grouping of functions that are unrelated by function, timing, logic, procedure, or by sequence.

Temporal cohesion occurs where a module contains several functions that must be performed at the same time, but are not closely related by function.

Logical cohesion is where several logically related functions are placed in the same module. For example a unit may handle all input to a program irrespective of its source being from disk, communications port, keyboard, etc.

Procedural cohesion is where functions that must be performed in a certain order are grouped together in the same module.

Sequential cohesion occurs when the output from one part of a module is the input to the next part, but if the module is not constructed for functional cohesion it is possible that not all the related parts will occur in the one module.

High functional cohesion might be seen as one characteristic of good design. See also coupling.

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adhesion and cohesion

adhesion and cohesion, attractive forces between material bodies. A distinction is usually made between an adhesive force, which acts to hold two separate bodies together (or to stick one body to another) and a cohesive force, which acts to hold together the like or unlike atoms, ions, or molecules of a single body. However, both forces result from the same basic properties of matter. A number of phenomena can be explained in terms of adhesion and cohesion. For example, surface tension in liquids results from cohesion, and capillarity results from a combination of adhesion and cohesion. The hardness of a diamond is due to the strong cohesive forces between the carbon atoms of which it is made. Friction between two solid bodies depends in part upon adhesion.

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cohesion

cohesion
1. The force of attraction between like molecules. Cohesion provides the force that holds up a column of water in the xylem tissue of plants without it breaking. The cohesion–tension theory is the most widely accepted explanation for the continual flow of water upwards through the xylem of a plant. Water is removed from the plant by the process of transpiration, which creates a tension that pulls the water in the xylem upwards as a single column held together by cohesive forces.

2. (in botany) The union of like parts, such as the fusion of petals that occurs in some flowers.

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cohesion

cohesion Ability of particles to stick together without dependence on interparticle friction. In soils, cohesion is due to the shearing strength of the cement or film of water that separates individual grains. In powder technology, cohesion refers to the forces of attraction by which the particles are held together either by compaction or a binding substance.

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cohesion

co·he·sion / kōˈhēzhən/ • n. the action or fact of forming a united whole: the work at present lacks cohesion. ∎  Physics the sticking together of particles of the same substance.

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cohesion

cohesion Mutual attraction between the component atoms, ions or molecules of a substance. Weak cohesive forces permit the fluidity of liquids; those of solids are much stronger. Liquids form droplets because of surface tension caused by cohesion.

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cohesion

cohesion The ability of particles to stick together without dependence on interparticle friction. In soils, cohesion is due to the shearing strength of the cement or film of water that separates individual grains.

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cohesion

cohesion: see adhesion and cohesion.

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adhesion

adhesionabrasion, Australasian, equation, Eurasian, evasion, invasion, occasion, persuasion, pervasion, suasion, Vespasianadhesion, cohesion, Friesian, lesion •circumcision, collision, concision, decision, derision, division, elision, envision, excision, imprecision, incision, misprision, precisian, precision, provision, scission, vision •subdivision • television • Eurovision •LaserVision •corrosion, eclosion, erosion, explosion, implosion •allusion, collusion, conclusion, confusion, contusion, delusion, diffusion, effusion, exclusion, extrusion, fusion, illusion, inclusion, interfusion, intrusion, obtrusion, occlusion, preclusion, profusion, prolusion, protrusion, reclusion, seclusion, suffusion, transfusion •Monaghan • Belgian •Bajan, Cajun, contagion, TrajanGlaswegian, legion, Norwegian, region •irreligion, religion •Injun • Harijan • oxygen • antigen •sojourn • donjon • Georgian •theologian, Trojan •Rügen •bludgeon, curmudgeon, dudgeon, gudgeon, trudgen •dungeon • glycogen • halogen •collagen • Imogen • carcinogen •hallucinogen • androgen •oestrogen (US estrogen) •hydrogen • nitrogen •burgeon, sturgeon, surgeon

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cohesion

cohesionabrasion, Australasian, equation, Eurasian, evasion, invasion, occasion, persuasion, pervasion, suasion, Vespasianadhesion, cohesion, Friesian, lesion •circumcision, collision, concision, decision, derision, division, elision, envision, excision, imprecision, incision, misprision, precisian, precision, provision, scission, vision •subdivision • television • Eurovision •LaserVision •corrosion, eclosion, erosion, explosion, implosion •allusion, collusion, conclusion, confusion, contusion, delusion, diffusion, effusion, exclusion, extrusion, fusion, illusion, inclusion, interfusion, intrusion, obtrusion, occlusion, preclusion, profusion, prolusion, protrusion, reclusion, seclusion, suffusion, transfusion •Monaghan • Belgian •Bajan, Cajun, contagion, TrajanGlaswegian, legion, Norwegian, region •irreligion, religion •Injun • Harijan • oxygen • antigen •sojourn • donjon • Georgian •theologian, Trojan •Rügen •bludgeon, curmudgeon, dudgeon, gudgeon, trudgen •dungeon • glycogen • halogen •collagen • Imogen • carcinogen •hallucinogen • androgen •oestrogen (US estrogen) •hydrogen • nitrogen •burgeon, sturgeon, surgeon

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