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Subject perform on is a kind of have steps has definition
usability evaluation verification  
heuristic evaluationa finished system or a prototypeusability evaluation
  1. pick some user cases to evaluate, focussing initially on the most important ones
  2. for each window, page or dialog that appears during the execution of the use case, study it in detail to look for possible usability defects: violations of the principles and guidelines (the heuristics) discussed in the previous section
  3. write down a description of each defect and any ideas for how the defect might be fixed
The process of systematically looking for usability defects in a user interface, based on a set of usability guidelines or principles

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