Software description to match DFD of School Timetable:
SQL server DBMS: Create Initial Timetable
LAN: Genertate student, teacher, adn locate teacher and student timetables and execute timetable query.
Timechart: Create initial timetable, generate teacher and student timetable.
SAS timetable module: Locate teacher or student, execute timetable query.
Classify external entities on C.D (fig 2.4) as either source and/or a sink.
Vocal Inspectors: Source,
Customers: Source, sink
Police departments: Source, sink
Other governemnt departments: Source, sink
Vehicle Dealers: Source
Insurance Companies: Source
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