These techniques were characterized by their use of diagrams : structure charts for structured design, and data flow diagrams for structured analysis, both to aid in communication between users and developers, and to improve the analyst's and the designer's discipline.
42.
SA and SD are displayed with structure charts, data flow diagrams and data model diagrams, of which there were many variations, including those developed by Tom DeMarco, Ken Orr, Larry Constantine, Vaughn Frick, Ed Yourdon, Steven Ward, Peter Chen, and others.
43.
As described in their book it was little more than an object-based extension of data modelling . " In line with comment Capretz ( 1996 ) argues that the Shlaer Mellor method " fails to account for the vast majority of object-oriented ideas and an ordinary graphical notation is prescribed ", which is primarily taken " from entity relationship diagrams and data flow diagrams found in other structured methods ".
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