The Title of this paper presupposes the existence of the most important and fundamental document, namely a clear specification of design requirements.

The normal sequence of activities after receipt of the specification is as follows: —

1. Design.

2. Prototype and Experimental batch manufacture.

3. Development (and Approval Testing).

4. Production.

5. Customers’ Use.

The function of Design and Development determines the ability of the design to meet the specification, and this can be classified as the “Quality of Design.”