Once user needs and goals are recorded as user requirements, the emphasis shifts to requirements analysis. User requirements, even specific and measurable ones, correspond to wish lists from the various stakeholders. Requirements analysis prioritizes these wish lists to define precisely what to build as a product; see . To prioritize, we must answer three questions. First, what properties of the product will prioritization be based on? Examples of properties include not only cost and functionality, but usefulness, usability, and desirability. Second, how will the properties be quantified? Quantification involves classification into ranked categories; for example, must-have, should-have, could-have, won’t have. Third, how do we rank order requirements based on a combination of properties, such as benefit, cost, and perhaps risk?
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