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     学び始める
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      Descriptions of what the system should do: the services that it provides and the constraints on its operation   
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      what are user requirments?    学び始める
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      features the user needs the software product to support   
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      What are system requirements?    学び始める
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      things the software needs to function   
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      what are functional requirements?    学び始める
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      defines a function of a system or its component. A function is described as a set of inputs, the behavior, and outputs.   
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      what are non functional requirements?    学び始める
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      a requirement that specifies criteria that can be used to judge the operation of a system, rather than specific behaviors. They are contrasted with functional requirements that define specific behavior or functions.   
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      What is requirements engineering?    学び始める
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      The process of gathering, analysing, documenting, and checking requirements   
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      what are teh 4 stages of Requirements engineering?    学び始める
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      ▶ Feasibility study ▶ Requirements elicitation ▶ Requirements specification ▶ Requirements validation   
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      What is a feasibility study?    学び始める
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      an assessment of the practicality of a proposed plan or method.   
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      What is requirments elicitation?    学び始める
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      the practice of collecting the requirements of a system from users, customers and stakeholders. AKA "requirement gathering" Commonly used elicitation processes are the stakeholder meetings or interviews.   
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      Whata re the 4 stages of Requirements Elicitation?    学び始める
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      1) discovery and understanding 2) clasification adn organisation 3) prioritisation and negotiation 4) documenttation   
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      what are the main methods of requirements elicitation?    学び始める
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      interviews, focus groups, scenarios, use cases, ethnography   
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     学び始める
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      wtaching how people work and understanding based on observation   
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