Change analysis and costing•The effect of the proposed change is assessed using traceability information and general knowledge of the system requirements. Once this analysis is completed, a decision is made whether or not to proceed with the requirements change.Change implementation •The requirements document and, where necessary, the system design and implementation, are modified. Ideally, the document should be organized so that changes can be easily implemented.Chapter 4 Requirements Engineering6330/10/2014Requirements change managementChapter 4 Requirements Engineering6430/10/2014Key pointsRequirements for a software system set out what the system should do and define constraints on its operation and implementation.Functional requirements are statements of the services that the system must provide or are descriptions of how some computations must be carried out. Non-functional requirements often constrain the system being developed and the development process being used. They often relate to the emergent properties of the system and therefore apply to the system as a whole.Chapter 4 Requirements Engineering6530/10/2014Key pointsThe requirements engineering process is an iterative process that includes requirements elicitation, specification and validation.Requirements elicitation is an iterative process that can be represented as a spiral of activities –requirements discovery, requirements classification and organization, requirements negotiation and requirements documentation.You can use a range of techniques for requirements elicitation including interviews and ethnography. User stories and scenarios may be used to facilitate discussions.Chapter 4 Requirements Engineering6630/10/2014
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12/12/201812Key pointsRequirements specification is the process of formally documenting the user and system requirements and creating a software requirements document.The software requirements document is an agreed statement of the system requirements. It should be organized so that both system customers and software developers can use it.Chapter 4 Requirements Engineering6730/10/2014Key pointsRequirements validation is the process of checking the requirements for validity, consistency, completeness, realism and verifiability. Business, organizational and technical changes inevitably lead to changes to the requirements for a software system. Requirements management is the process of managing and controlling these changes.Chapter 4 Requirements Engineering6830/10/2014
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