Refer to Figure 7-23, which contains drafts of a context and level-0 DFD for a u

Question

Refer to Figure 7-23, which contains drafts of a context and level-0 DFD for a university class registration system. Identify and explain potential violations of rules and guidelines on these diagrams.

Context Diagram Class Schedule Student 0 Course Request Class Registration System List of Courses Possible Classes Scheduled Classes Department Roster D1 of Classes Level-0 Diagram 3 Course Request Class From Student To Student Receive Course Request CheckSchedule for Availability Course Scheduled Request Classes Possible Classes 2 List of Courses From Department Receive Course Lists Class Roster D2 Copyright ©2014 Pearson Education

Explanation / Answer

Rules for creating DFDs from context diagrams

Rules

Please find the violation in the DFD below :

1) In Level-0 DFD, Data store D2(Class Roster) has no in-flow, which is a violation.(Each data store must have at least one data flow going into it and one data flow leaving it.)

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