From Concept to product-

The abstract design concept consisting of the outline, an idea from here and a mechanism from there, expresses only a plausible relationship among elements thatpromises to fulfill the needs of the given problem. We then carry out a feasible study to estimate the chance of such plausible relationship being converted into a physical reality. However, unless we actually do produce the envisaged physical reality it is merely an intellectual exercise. The next step in the design process is the development of the design concept into a design that will work to the satisfaction of all concerned.