Question

Exercise 2:

“Jordan Video-Rental” is a small video rental store. The store lends videos to customers

for a fee, and purchases its videos from a local supplier. A customer wishing to borrow a

video provides the empty box of the video they desire, their membership card, and

payment – payment is always with the credit card used to open the customer account.

The customer then returns the video to the store after watching it. If a loaned video is

overdue by a day the customer's credit card is charged, and a reminder letter is sent to

them. Each day after that a further chard is made, and each week a reminder letter is

sent. This continues until either the customer returns the video, or the charges are equal

to the cost of replacing the video. New customers fill out a form with their personal details

and credit card details, and the counter staff give the new customer a membership card.

Each new customer's form is added to the customer file. The local video supplier sends a

list of available titles to Video-Rental LTD, who decide whether to send them an order and

payment. If an order is sent, then the supplier sends the requested videos to the store.

For each new video a new stock form is completed and placed in the stock file.

Create a context diagram for this video rental system.

Answer 1

In order to make a Context diagram, one has to illustrate the information flow between the video rental system (system of interest and external bodies in this case buyers, and suppliers. It helps to show what type fo information evokes activities in the system of interest (video rental service).

A context diagram is given below: