Design by Evolution-

One characteristic feature of this process of design by evolution was that the designers worked largely by themselves, and communicated their ideas to others only through their work. Pieces of design onformation were stored in memory, learnt and passed down during the long periods of apprenticeshop of the master craftsmen. The overall shape of the product and the process of achiving it were passed on to the future generations of artisans, but the reasons for the same were lost in the absence of any tradition of codifying the design features.