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QUESTION 1
(a) Draw a use-case model for the above system. You must identify all possible actors and use-cases.
(b)
(c) Explain the difference between a structured methodology for developing software and the object-oriented approach. Use examples to illustrate your answer.
QUESTION 2
(a) Build a class model for the above system. You must identify all possible classes, their relationships, relationship multiplicities, two attributes and two methods for each class.
(b) Explain the difference between a link and an association. Use a simple example to illustrate your answer.
(c) Briefly explain the terms ‘cohesion' and ‘coupling'.
(d) What are the main factors which contribute to software complexity?
QUESTION 3
(a) Draw a Sequence Diagram for the process of assigning a driver to a particular bus going on a special route. Show clearly the objects involved and the flow of messages.
(b) What is a state diagram? Use an example from the case study to illustrate your answer.
When an error is discovered the receiver is able to ask the sender to retransmit the entire data unit Error Correction-Forward Error Correction A receiver is able to u
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