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observation comparison table
Subject done during take involve has definition have purpose is a kind of
requirements gathering   A step in requirements analysis in which information is obtained that will form the basis of the requirements process
observationthe development of large systems, with which potential users will be performing complex tasks, because observation, and analysing the resulting information, can consume a large amount of timea lot of timetaking a notebook and 'shadowing' important potential users as they do their work, writing down everything they do, asking users to talk as they work and explain what they are doing, and perhaps videotaping the session so you can analyze it in more detail later to gather subtle information that stakeholders may not think of telling yourequirements gathering

Next requirements gatheringprototyping    Uprequirements gathering    Previous requirements gatheringJoint Application Development