By Arthur M. Langer (auth.)
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Extra resources for Analysis and Design of Information Systems
The analyst must first understand the boundary and flows prior to doing anything else. The steps following this will procedurally gather more detailed information until the specification is complete. Another important aspect of the DFD is that it represents a graphical display of the process and is therefore a usable document that can be shown to 4. Process-Based Tools 51 both users and programmers, serving the former as a process verification and the latter as the schematic (blueprint) of the system from a technical perspective.
2 has one input and one output and is therefore complete. 2 is said to be at the Functional Primitive, a DFD that cannot be decomposed further. 1 will be decomposed. 2 Level 2 data flow diagram for handling bounced checks. 3. 1. 3 Level 3 data flow diagram for handling bounced checks. 2 Infonn Correction Department. 2 is a Functional Primitive since it has one input and one output. 1 is also considered a Functional Primitive because the "Bounced Check Packet" flow is between the two processes and is used to show connectivity only.
You may have no choice but to use JAD when there are simply too many users to interview. JAD is also an excellent tool for use in highly political situations where obtaining consensus among users is difficult. JAD significantly differs from standard analysis in that it requires an up-front commitment from the user community. Specifically, the users must ultimately run the sessions themselves and make commitments to provide the requirements of the system. Finally, if prototypes are used, JAD is an excellent means of applying rapid application development (RAD).