1. Information System Analysis
Lab 6

2. In this lab we will learn :
Discuss level 0 diagram for Easy Travel Agency specifications.

3. Example 2: Easy Travel Agency specifications
EasyTravel is a travel agency specializing in family holidays. It holds lists of hotels and charter flights and creates organized holidays for clients. Currently the company uses a paper based system.
The company its tasks by the following text:
Bookings are made either through a list of agents, or by direct approach from clients.
When a client/agent makes an approach, the Reservations Clerk selects appropriate flight and hotel details for the customer and makes a provisional booking. The details are entered onto a provisional booking file.

4. Easy Travel Agency specifications
The customer must confirm this booking within three days, by sending a deposit of 10% of costs. On receipt of this deposit, Reservations close the provisional booking and add the details to their full booking file.
Four weeks before the flight is due, Accounts send an invoice to the clients for the balance. Accounts notify Customer Services when the balance is received and Customer Services then send tickets and joining instructions.
Reminders are sent to customers three weeks and one week before departure. Although the company insists that payment is made at least one week before departure, it has been known that payment has been made and tickets received on the morning of the flight.
At the end of each month, commission of 15% is paid to any agents responsible for holidays commencing during that month.

5. Agency Booking system Context Diagram Provisional booking
Agency
Booking
system
Provisional booking
Client details
Invoice
Client/Agent
Pay 10%
Client/Agent
Ticket instruction
Reminders
Pay balance
15% commissions
Agent

6. Creating DFD
2-Draw level 0 diagram

7. Booking
Client details
1.0
Reservation
D1:provisional booking file
Close
Client/agent
Pay 10%
Booking D.
Client/agent
Provisional Booking
Full Booking
D2:full booking file
Booking details
2.0
Account
Pay balance
Invoice
15%commission
agent
Balance received
Ticket instruction
3.0
Customer
serves
Client/agent
reminders

8. 2-Draw level 1 diagram for process 1
Creating DFD
2-Draw level 1 diagram for process 1

9. level 0 diagram -Process 1
Booking
Client details
1.0
Reservation
D1:provisional booking file
Close
Client/agent
Booking detail
Client/agent
Provisional Booking
Full Booking
D2:full booking file

10. Select flight and hotel
Draw level 1 diagram for process 1
Client details
1.1
Select flight and hotel
Client/agent
Flight and hotel info
Client/agent
Provisional Booking
1.2
Provisional booking
Booking
D1:provisional booking file
closing
1.3
Confirm booking
Pay 10%
Booking detail
D2:full booking file
Full booking

11. Level 1 DFD Diagram
Generally, level 1 diagram is created for every major process on the level 0 diagram
Shows all the internal processes that are inside a single process on the level 0 diagram
Shows how information moves between these processes
If a parent process is decomposed into, for example, three child processes, these three child processes wholly and completely make up the parent process