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Modelling object-oriented software – an introduction
Modelling object-oriented software – an introduction

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Modelling object-oriented software – an introduction

4.2.1 System domain

The DVD Library holds DVDs of a number of films. It may have any number of copies of each film. The system should, for each film , hold the film's title; no two films have the same title.

A library member can borrow any DVD of a film that is not currently on loan. However, no member can have more than six DVDs on loan at once. A borrowed DVD must be returned within three days. When a library member returns a DVD it immediately becomes available for loan to other members.

Each DVD has a unique identifying number.

Each member of the library has a unique membership number; the system also holds each member's name.

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