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Vincent and others at Bell Telephone of Canada had developed a methodology called SAPTAD; Yourdon and Constantine described transaction analysis as "a more flexible, more sophisticated updating of the SAPTAD technique." "Transaction analysis," Yourdon and Constantine wrote, "is suggested by data flow graphs resembling Fig.11.1 — that is, where a transform splits an input data stream into several discrete output sub-streams." Here is Figure 11.1. Most, if not all, GUI systems and toolkits are designed to be event driven, meaning that the main flow of your program is not sequential from beginning to end. If you're trying to program your first GUI application, or trying to learn how to parse XML with a SAX parser, you've experienced the difficulties first-hand.Thanks to my co-worker Gary Ault, who reported a mistake in one of the state transition diagrams. A transform is represented in Data Flow Diagram terms by a linear network. On a DFD, a record in a sequential file was conceptualized as a packet of data moving through a pipeline, or along a conveyor belt, called a and provided this diagram. Raw materials come in one door; they are processed, processed, processed; and at the end of the processing, a finished product is pushed out another door. The standard model of a computer system was an assembly line.

But the topic received more attention in Ed Yourdon and Larry Constantine's book . The origin of the term "structured" was a paper called "Structured Design" by Glenford J. Stevens, and Larry Constantine, that appeared in the (DFDs) to show the logical structure of a computer system. The most successful advocate of structured methods was Edward Yourdon – so much so that the expressions "Yourdon" and "structured analysis and design method" became almost synonymous.A transaction center of a system must be able to · get (obtain and respond to) transactions in a raw form · analyze each transaction to determine its type · dispatch on type of transaction · complete the processing of each transaction A dataflow diagram shows the logical functions that a system must perform, but it doesn't say anything about the design of the program that will perform those functions.

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In structured analysis and design, a different diagram called a was used to show program design.

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