Nassi–Shneiderman chart

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Nassi–Shneiderman chart (NS chart) A kind of diagram (devised 1973–74) for representing the sequence of execution in a program. The diagram takes the form of a rectangle divided mainly into smaller rectangles with the sequence of execution going from top to bottom of the diagram. There are various standard constructs, including NS sequence structures, NS repetition structures, and NS selection structures.