As an alternative, rapid prototyping or rapid application development techniques are used for the initial prototypes, which implement part, but not all, of the complete design.This allows designers and manufacturers to rapidly and inexpensively test the parts of the design that are most likely to have problems, solve those problems, and then build the full design.Regardless of where wireframes fit into the requirements package, they can be useful in all phases of the requirements process, from defining the scope to the implementation hand-off.During the initiation of a new project, some rudimentary mock-ups can help elicit new requirements and create alignment around project scope.
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I often find gaps as I try to get from point A to point B to realize we have missed a field or an entire screen and overlooked an important requirement as well.
In the final stages, prototypes can also be used as a tool to vet the final rules.