Question

. You have been asked to build a course registration system for your university

Develop an entity-relationship diagram that describes data objects, relationships and attributes.

Draw a context-level model (level 0 DFD/CFD) for your system. Write a context level processing narrative for the system.

Draw a level 1 DFD/CFD for your system.

2. What is the difference between cardinality and modality? (Pressman 6.4.3 7th Ed or Pressman 8.3.4 6th Ed)

3. Does the information flow continuity concept mean that if one flow arrow appears as input at level 0, then one flow arrow must appear as input at subsequent levels? Discuss your answer.
4. Describe an event or control flow in your own words. How can we model an event or control flow with a dataflow? Why is this not a good idea?
5. Draw state transition diagrams for the control software for each of the following:

i. An automatic washing machine which has different programs for at least two different types of clothes. The washing cycle should be suspended whenever the lid of the washing tub is raised and resumed when it is lowered. (Assume the washing machine is a simple older type with limited electronic control)

ii. A coffee vending machine that can dispense coffee with or without sugar and milk. The user deposits a coin and makes his or her selection by pressing a button on the machine. This causes a cup with instant coffee plus other ingredients to be output. The user then places the cup under a tap, presses another button and hot water is dispensed.

Answer 1

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