B$4.$

The British Library is a public library based in London and Yorkshire that stores over $170$

million items. The library is open to visitors, but only members have access to their collections

and reading rooms.

There are two types of Members, Online and Full. All members must apply for an online

account, providing their personal details, such as name, address, age and contact details.

Once registered, members have access to electronic items.

To gain access to non$-$electronic items, such as books or journals and to the Reading rooms,

an online member has to apply for full membership, which involves booking an appointment

with a Librarian, where they need to provide two pieces of identification. If acceptable, the

member will be issued a Reader Pass, which is valid for $3$ years if UK based, or $1$ year if

international. If a pass is still required after this time, the Full Member will have to renew their

membership.

The catalogue of the library$$s collections can be searched online; online members can view

electronic items immediately.

Full Members can view non$-$electronic items by booking a space in one of the Reading

Rooms. To view the items the Full Member will need to order the collection items they wish to

see. This can be done on the day of the booking, or in advance since some items are stored

offsite and must be retrieved first. Full members can view their orders online.

Each Librarian oversees one of the collections. Each month they produce a report on the

collection$$s statistics, such as how often the items in the collection have been requested.

a$)$ Draw a Use Case diagram for the library system.

$(15$ marks$)$

b$)$ Discuss why you should make use of Use Case diagrams and descriptions during the

software development life cycle.

$(10$ marks$)$