A product’s must-have features do not need to be developed in the first iterations of a release. However, because users consider these features to be mandatory, they need to be available before the product is released. Keep in mind, though, that partial implementation of must-have features may be adequate, because gains in customer satisfaction drop off quickly after a base level of support for threshold features has been established. For example, I am writing this book with Adobe FrameMaker, which pays lip service to an undo feature by allowing one level of undo. For me personally, they moved
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