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Discount usability engineering is one of Jakob Nielsen's hobbyhorses and indeed his most valuable contributions to web and software design. In his contribution to the book Cost-Justifying Usability Nielsen states that software developers rarely use the recommended usability engineering methods, because they are seen as too costly, too time consuming, and all in all intimidating in their complexity.
In the paper Nielsen shows how to conduct discount usability and give some examples of how to estimate usability ROI.
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