The intended usage of a tool is the basis for defining its features. The features of a tool
determine its appropriate usage. Tools should perform reliably when used appropriately. A tool
is sometimes applied to a task it was not intended for (e.g. a screwdriver applied as a chisel).
In this instance, the performance of the tool may not be satisfactory due to an unrealistic
expectation or failure of an implied capability. Recognizing unintended uses of a tool adds
strength and character to it.
Not surprisingly, a small screwdriver is appropriate for turning small screws. This application
assumes a set of criteria:
Overall, the tools in this toolset are very suitable to their appropriate usage with some room for
improvement in the tips of the interchanqeable screwdriver blades.
- the width and thickness of the blade should accomodate a target set of screws.
- the handle should provide a satisfactory human/tool interface within the constraints of comfort,
torque capability and size.
- the proportions should be suitable for the target operating environment.