6. Prototype evaluation and modification
Step six is exciting. This is when we modify the best
prototypes to make them even better. Improvements are
based on in-depth analysis of the preceding user tests.
This phase takes two to three months. We are now laying
the foundations for the finished design.
We begin by improving the size and shape of the handle.
We decide whether to make the tool in several sizes,
or whether the same tool should be suitable for use
by hands of many different sizes and shapes. We decide
which materials to use, and what surface friction these
materials should possess.
We complete this phase by producing a limited number
of refined prototypes.
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