Chapter Eighteen

Afferent module A module of a structure chart related to input to the system. See also Efferent module.
Central transform The area of a transform-centered information system where the most important derivation of new information takes place. See also Transform analysis.
Data couple A diagrammatic representation of the data exchanged between two modules in a structure chart. See also Flag.
Efferent module A module of a structure chart related to output from the system. See also Afferent module.
Flag A diagrammatic representation of a message passed between two modules. See also Data couple.
Module A self-contained component of a system, defined by function.
Pseudocode A method for representing the instructions in a module with language very similar to computer programming code.
Structure chart Hierarchical diagram that shows how an information system is organized.
Transaction analysis The process of turning data flow diagrams of a transaction-centered system into structure charts. See also Transform analysis.
Transaction-centered system An information system that has as its focus the dispatch of data to their appropriate locations for processing.
Transform analysis The process of turning data flow diagrams of a transform-centered system into structure charts. See also Transaction analysis.
Transform-centered system An information system that has as its focus the derivation of new information from existing data. See also Central transform.

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