1. Using the example of checking out a book from your university or college library, draw a Context diagram and a level-0 diagram. A suggested context diagram and a level-0 diagram are provided below.

2. A company has various rules for how payments to suppliers are to be authorized. Some payments are in response to an approved purchase order. For approved purchase orders under $5,000, the accounting clerk can immediately issue a check against that purchase order and sign the check. For approved purchase orders between $5,000 and $10,000, the accounting clerk can immediately issue a check but must additionally obtain a second signature. Payments for approved purchase orders over $10,000 always require the approval of the accounting manager to issue the check as well as the signature of two accounting clerks. Payments that are not covered by a purchase order that are under $5,000 must be approved by the accounting manager and a departmental manager that will absorb the cost of the payment into that departments budget. Such checks can be signed by a single accounting clerk. Payments that are not covered by a purchase order that are between $5,000 and $10,000 must be approved by the accounting manager and a departmental manager, and the check must have two signatures. Finally, payments that are not covered by a purchase order that exceed $10,000 must be approved by a department manager, the accounting manager, and the Chief Financial Officer. Such checks require two signatures. Use a decision table to represent the logic in this process. Write down any assumptions you have to make.

3. Suppose an information system were developed following a rapid application development approach like prototyping. How might maintenance be different than if the system had been developed following the traditional life cycle? Why?