A-LevelComputer ScienceComputational thinking and problem-solving9618/21 · Oct/Nov 2022 · Q25 Marks

A system is being developed to help manage a car hire business. A customer may hire a car for a number of days. An abstract model needs to be produced.

(a)Explain the process of abstraction and state four items of data that should be stored each time a car is hired.[3]
(b)Identify two operations that would be required to process the car hire data.[2]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

[1] (a) Abstraction is used to filter out information / data that is not necessary for the task
[1] (a) Or the opposite: To keep only information / data that is necessary for the task
[1] (a) Car details: ID, Car Registration, car type etc
[1] (a) Customer details: ID, name, address, licence details etc
[1] (a) Start date (of hire)
[1] (a) Return date / Number of days (of hire)
[1] (a) Cost of hire
[1] (b) Input customer details
[1] (b) Input car details
[1] (b) Input payment details
[1] (b) Create hire / start hire
[1] (b) Return car / end hire
[1] (b) Change / check car status (hired / available / written-off)
[1] (b) Cancel hire
[1] (b) Process payment / calculate cost

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