95 c h a p t e r 5 Risk reduction through prototyping

 

CHAPTER 15

 

Risk reduction through prototyping 

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Because of the risk of confusion, it’s important to put some descriptors in front of the word 

 “prototype” so the project participants understand why and when you might create one type of 

 prototype or another. This chapter describes three classes of prototype attributes, each of which has 

two alternatives:

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Scope  A mock-up prototype focuses on the user experience; a proof-of-concept prototype 

explores the technical soundness of a proposed approach.

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Future use  A throwaway prototype is discarded after it has been used to generate feedback, 

whereas an evolutionary prototype grows into the final product through a series of iterations.

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Form  A paper prototype is a simple sketch drawn on paper, a whiteboard, or in a drawing 

tool. An electronic prototype consists of working software for just part of the solution.

Each prototype you create will possess a specific combination of these attributes. For instance, you 

could devise a throwaway paper mock-up having simple drawings of possible screens. Or you might 

build an evolutionary electronic proof-of-concept, working software that demonstrates a desired 

technical capability that you can then grow into a deliverable product. Certain combinations don’t 

make sense, though. For instance, you couldn’t create an evolutionary paper proof of concept.