Question

SUBJECT BTA (Foundations of B.A.)

Case Study

Spring Breaks R Us Travel Service

Chapter 3 – Use Cases

Spring Breaks ‘R’ Us (SBRU), introduced in Chapter 2, includes many use cases that make up the functional requirements. Consider the following description of the Booking subsystem. A few weeks before Thanksgiving break, it is time to open the system to new bookings. Students usually want to browse through the resorts and do some planning. When a student or group of students wants to book a trip, the system allows it. Sometimes, a student needs to be added or dropped from the group or a group changes size and needs a different type of room. One month before the actual trip, it is time for the system to send out final payment requirement notices. Students cancel the booking or they pay their final bills. Students often want to look up their booking status and check on resort details. When they arrive at the resort, they need to check in; and when they leave, they need to check out.

Case Question:

1. Using the event decomposition technique for each event you identify in the description here, name the event, state the type of event, and name the resulting use case. Draw a use case diagram for these use cases
2. Consider the new Social Networking subsystem that SBRU is researching that was described in Chapter Identify all the actors who might use the subsystem. Think in terms of the user goal technique to identify as many use cases as you can think of that you would like to have in the system. SBRU is guessing you might want to join, send messages, and so forth, but there must be many interesting and useful things the system could do before, during, and after the trip. Draw a use case diagram for these use cases.

Answer 1

Step 1:

Event decomposition technique: Event decomposition technique is another approach to

identify the use case. • Use cases are recognized by determining the business

events and its response from system. • Business event helps the system analyst to take right decision for defining the use case in detailed manner.

• This technique is more comprehensive to identify the

use case.

Types of Event:

• Event occurs at a particular time and it can be defined

and must be remembered by system. • Event triggers all system processes and it is of three

types. They are,

External event:

• External event is an event from external agent that is initiated by actor or user.

Temporal event: • Temporal event is an event from result of the reaching

time. State event:

• State event is an event from inside the system or change of state in system.

Step 2:

Use cases identified using event decomposition technique:

The events, which are described in the textbook, are listed with an event name along with the type of event and its use case.

Events	Type	Use case
Student surfs resorts information	External	Show resort info
Student surfs resorts packages	External	Show resort package info
Student group requests reservations	External	Reserve student group
Adds/deletes the group participants	External	Modify group booking
Time to transmit the payment requirements	Temporal	Send payment notices
Verify on booking details	External	Show booking details
Students verify in	External	Upgrade reservation info(hotel)
Student verify out	External	Upgrade reservation info(hotel)

Step 3:

Explanation:

In the above use case diagram,

• Show resort info, Show resort package info, Reserve student group, Modify group booking, Send payment notices, Show booking details, Upgrade reservation info are the use cases.
• Student and Resort owner are the actors.
• Student is a person who can browse the resort information and plan for trip, add/delete from the group, pay the final bills, check the booking details, and update the reservation information when they arrive and they leave the resort.
• Resort owner is a person who can display the resort information, package information, payment notice, and booking details.
• The associate relationship between actors and use cases are represented with the lines.