Use cases identify the actors in an interaction and

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Use cases identify the actors in an interaction and which describe the interaction itself. A set of use cases should describe all possible interactions with the system. High-level graphical model supplemented by more detailed tabular description (see Chapter 5). UML sequence diagrams may be used to add detail to use-cases by showing the sequence of event processing in the system. Chapter 4 Requirements Engineering 50 30/10/2014 Use cases for the Mentcare system Chapter 4 Requirements Engineering 51 30/10/2014 The software requirements document The software requirements document is the official statement of what is required of the system developers. Should include both a definition of user requirements and a specification of the system requirements. It is NOT a design document. As far as possible, it should set of WHAT the system should do rather than HOW it should do it. Chapter 4 Requirements Engineering 52 30/10/2014 Requirements validation Concerned with demonstrating that the requirements define the system that the customer really wants. Requirements error costs are high so validation is very important Fixing a requirements error after delivery may cost up to 100 times the cost of fixing an implementation error. Chapter 4 Requirements Engineering 53 30/10/2014 Requirements checking Validity. Does the system provide the functions which best support the customer s needs? Consistency. Are there any requirements conflicts? Completeness. Are all functions required by the customer included? Realism. Can the requirements be implemented given available budget and technology Verifiability. Can the requirements be checked? Chapter 4 Requirements Engineering 54 30/10/2014
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12/12/2018 10 Requirements validation techniques Requirements reviews Systematic manual analysis of the requirements. Prototyping Using an executable model of the system to check requirements. Covered in Chapter 2. Test-case generation Developing tests for requirements to check testability. Chapter 4 Requirements Engineering 55 30/10/2014 Requirements reviews Regular reviews should be held while the requirements definition is being formulated. Both client and contractor staff should be involved in reviews. Reviews may be formal (with completed documents) or informal. Good communications between developers, customers and users can resolve problems at an early stage. Chapter 4 Requirements Engineering 56 30/10/2014 Review checks Verifiability Is the requirement realistically testable? Comprehensibility Is the requirement properly understood? Traceability Is the origin of the requirement clearly stated? Adaptability Can the requirement be changed without a large impact on other requirements? Chapter 4 Requirements Engineering 57 30/10/2014 Changing requirements The business and technical environment of the system always changes after installation.
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  • Fall '19
  • Requirements analysis, Requirements Engineering,  Functional

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