Module 2… Talking with computers

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Presentation transcript:

Module 2… Talking with computers Design strategies Module 2… Talking with computers

Good design key to the creation of successful ICT systems technical performance appropriate standards at another level with the purely aesthetic features. Reliability, ease of use, manufacturing considerations are equally important. marketing

Stair strategy Statement – prepare a clear statement of the requirements. Tools – review your tools and select the most appropriate for the task. Actions – deciding the what, when and how. Implementation – executing the action plan. Review – verifying that your solution fulfils the requirements.

Design tools hierarchical task decomposition (HTD) top-down design flowcharting

Decomposing the ATM tasks Provide the user with a welcome message. Offer the user a predefined list of service options, which should include: cash withdrawal, account balance, request a new cheque-book, and termination of the transaction. Recognize the service option selected and provide the user with confirmation. Provide the user with the option to select another service. Provide the user with a polite closure message when no service option can be recognized.

Flowcharts

Initial flowchart for ATM

Alternate flowchart for ATM