By Carol Britton, Jill Doake
This is often one of many first-class publication needs to be learn through each company software developer. Eventhough the name is "A scholar advisor to Object-Oriented Development", truly it's greater than a scholar advisor. hugely recommended.
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Extra resources for A Student Guide to Object-Oriented Development
It is also important for the developer to find out about what happens when a goal is not achieved, for example a customer may come into Wheels to return a bike, but the bike card is missing. A scenario should be written for this sort of situation in the same way as for normal cases, so that the developer knows how the system should respond when things are not straightforward. REQUIREMENTS FOR THE WHEELS CASE STUDY SYSTEM REQUIREMENTS ELICITATION 9 Two customers, Paul and Debbie White, arrive at the shop with bikes to return 9 Annie contacts the mechanics to ask for someone to come and check the bikes 9 Annie gets the bike numbers, looks out the relevant bike cards and checks Paul and Debbie~ names and addresses 9 Annie makes sure that the bikes being returned are the ones on the cards 9 She checks to see if the bikes are being returned on time by verifying the return date against the current date 9 Annie finds that the bikes are one day overdue 9 She tells the customers that there is a charge for the extra day~ hire 9 One of the mechanics checks the bikes and confirms that they have been returned in good condition 9 Annie returns the customers' deposit, minus the extra day~ hire charge 9 Annie writes out a receipt for the extra charge.
As each use case models a significant task, the use cases provide ready made testing units. e. provides the functionality specified. The scenarios provide instances of the normal sequence of events in the use case and the main alternatives; exactly what is required for testing purposes. The developer must check that the system can handle each scenario. Checking the design of the system can be done by walking through each use case to verify that it can be realized. When the system has been implemented, system tests can be derived from the use cases to check that the code produces the required functionality.
It is useful to have two distinct types of use case description. 5)- These descriptions need only document the purpose of the use case, the actors involved and give a general overview of what happens. 6). 7 Template for an expanded use case Expanded use case description. This description is more detailed and structured than the high-level use case description. 7). Preconditions. Some practitioners include a section for preconditions in the e x p a n d e d use case descriptions. e. the use case 'Maintain bike list' must have been executed.