A-LevelComputer ScienceSoftware development9618/23 · Oct/Nov 2024 · Q76 Marks

A coffee shop owner wants to introduce a computerised loyalty card system. A programmer discusses the details of the system with the shop owner.

(a)Identify the stage of the program development life cycle that this discussion is part of and give a document that will be produced during this stage. Stage Document[2]
(b)The shop will give each customer a loyalty card that displays a unique customer ID as a bar code. A customer will be able to present their card each time they make a purchase. The system will scan the bar code, calculate points, and add them to the customer's total. When the customer next makes a purchase and presents their card, they will have the option to exchange points for a discount. The designer decides that this activity will be handled by a new module. Decomposition will be used to break the problem of designing the new module down into sub-problems (sub-modules). Identify four sub-modules that could be used in the design of the new module and describe their use. Sub-module 1 Use Sub-module 2 Use Sub-module 3 Use Sub-module 4 Use[4]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2024). The mark or mark type is shown in brackets.

[1] MP1 Analysis
[1] MP2 Named document, examples include: A requirement specification
[1] MP2 Named document, examples include: Definition of System Objectives
[1] MP2 Named document, examples include: List of problems with existing system
[1] MP2 Named document, examples include: Survey results
[1] MP2 Named document, examples include: Feasibility study
[1] MP2 Named document, examples include: Interview notes
[1] Sub-module: ScanCard() / GetID() Use: Read the barcode from the loyalty card / Get the customer ID from the barcode
[1] Sub-module: GetPoints() Use: Get the number of points the customer has
[1] Sub-module: ExchangePoints() / UpdateCard() Use: Reduce the number of loyalty points
[1] Sub-module: GetDiscount() / CalculateDiscount() Use: Calculate the discount
[1] Sub-module: CalculatePoints() Use: Calculate points (following a purchase)
[1] Sub-module: UpdatePoints() Use: Update total points a customer has (following a purchase)
[1] Sub-module: ShowDiscount() Use: Display the discount

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