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UNIT3 REQ_ENGEE_PROCESS - UNIT-3 Requirements Engineering...

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Requirements Engineering Processes UNIT-3
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To describe the principal requirements engineering activities and their relationships To introduce techniques for requirements elicitation and analysis To describe requirements validation and the role of requirements reviews To discuss the role of requirements management in support of other requirements engineering processes Objectives
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Topics covered Feasibility studies Requirements elicitation and analysis Requirements validation Requirements management
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Requirements engineering processes The processes used for RE vary widely depending on the application domain, the people involved and the organisation developing the requirements. However, there are a number of generic activities common to all processes Requirements elicitation; Requirements analysis; Requirements validation; Requirements management.
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The requirements engineering process Fe asibility stud y Re quir e me nts e licitation and anal ysis Re quir e me nts spe cification Re quir e me nts validation Fe asibility re por t Syste m mode ls Use r and syste m re quire me nts Re quir e me nts docume nt
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Requirements engineering Re quire me nts spe cification Re quire me nts validation Re quire me nts e licitation Syste m re quire me nts spe cification and mode ling Syste m re quire me nts e licitation U se r re quire me nts spe cification U se r re quire me nts e licitation Busine ss re quire me nts spe cification Prototyping Fe asibility study Re vie ws Syste m re quire me nts docume nt
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Feasibility studies A feasibility study decides whether or not the proposed system is worthwhile. A short focused study that checks If the system contributes to organisational objectives; If the system can be engineered using current technology and within budget; If the system can be integrated with other systems that are used.
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Feasibility study implementation Based on information assessment (what is required), information collection and report writing. Questions for people in the organisation What if the system wasn’t implemented? What are current process problems? How will the proposed system help? What will be the integration problems? Is new technology needed? What skills? What facilities must be supported by the proposed system?
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Elicitation and analysis Sometimes called requirements elicitation or requirements discovery. Involves technical staff working with customers to find out about the application domain, the services that the system should provide and the system’s operational constraints. May involve end-users, managers, engineers involved in maintenance, domain experts, trade unions, etc. These are called stakeholders.
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Problems of requirements analysis Stakeholders don’t know what they really want.
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