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CHAPTER 8 Requirements
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3. What functions are important to include in use case diagrams The important functions are those critical functions that convey the required functionality. 4. What criteria should be used to evaluate scenarios Every signi cant sequence of functions needs to be shown from the user s point of view. 5. What criteria should be used to evaluate state diagrams State diagrams need to show all possible transitions. Every arc in the diagram needs to have an event that caused the transition. There must also be a path from the start node to every node and from every node to a terminal node. 6. What is the advantage of a system diagram Being less formal, it can be more exible in expressing ideas about the overall system. 7. What can be a major problem with system diagrams The lack of formality can lead to ambiguous diagrams with one symbol being used for di erent ideas.
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Answers to Problems
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1. Draw an object model for the B&B problem (see Problem 4.3). See Fig. 8-8.
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date customer make res. cancel arrive check out
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reservation date
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Fig. 8-8.
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B&B object model.
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2. Draw an object model for the dental o ce problem (see Problem 4.2). See Fig. 8-9.
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dentist
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Requirements
daily sched. patient name make appt. cancel appointment procedures date
Fig. 8-9.
Dental o ce object model.
3. Draw a DFD for the B&B system (See Problem 4.3). See Fig. 8-10.
Date Check date Name Expenses Record expenses Record payments Answer query Availability Finances Reservations & expenses file Avail. date Make reservations Generate res. list Report finances Confirmation Daily reservations Weekly schedule Finance report
Payments Date
Fig. 8-10.
Data ow diagram for B&B.
4. Draw a DFD for the dental o ce system (see Problem 4.2). See Fig. 8-11.
Date Check date Patient data Name Check patient data Avail. date Make appointment Generate schedules Appointment file Patient records Confirmation Daily schedule Weekly schedule
Date
Answer query
Availability
Fig 8-11.
Data ow diagram for dental o ce.
CHAPTER 8 Requirements
5. Draw a use case diagram for the B&B problem (see Problem 4.3). See Fig. 8-12.
Make reservation Cancel reservation Owner Enter payments Analyze expenses
Print weekly schedule
Enter expenses
Fig. 8-12.
Use case diagram for B&B.
6. Draw a use case diagram for the dental o ce problem (see Problem 4.2). See Fig. 8-13.
Make appointment Query appointments Clerk Cancel appointment Print daily, weekly schedule Dentist Access patient records
Fig. 8-13.
Use case diagram for dental o ce.
7. Write scenarios for the B&B problem (see Problem 4.3).
Customer Call 1:
Customer calls about availability on a speci ed date. Sue brings up calendar for that week. There is a vacancy. Sue quotes a price. Sue gets name, address, telephone number, and credit card number. Sue enters information. Customer provides credit card to guarantee reservation.
Customer Call 2:
Customer calls about availability on a speci ed date. Sue brings up calendar for that week. There are no vacancies.
Customer Call 3:
Requirements
Customer calls about availability on a speci ed date. Sue brings up calendar for that week. There is a vacancy. Sue quotes a price. Sue gets name, address, telephone number, and credit card number. Sue enters information. Customer guarantees reservation. Reserve by date passes. Another customer requests that date. Nonguaranteed reservation is removed. 8. Write scenarios for the dental o ce problem (Problem 4.2). 1 Normal A patient calls for an appointment. The patient s name is recognized by the system. The system suggests a time. The patient accepts that time, and the receptionist enters the appointment. Two days before the appointment, the receptionist gets a reminder list with the patient s name and phone number. The receptionist calls to remind the patient. The patient comes for the appointment. After the appointment, the dental assistant schedules the patient s next appointment. 2 New Patient A patient calls for an appointment. The patient s name is not recognized by the system. The patient must be entered into the patient records system. 3 Multiple Appointments A patient calls and wants to make 6-month appointments for the next 2 years. The receptionist enters his name into the system and, when it is accepted, enters the agreed upon appointments.
9. Draw a state diagram for the B&B problem as a whole (see Problem 4.3). See Fig. 8-14.
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