Design making and iteration-

Design making plays a crucial role in the design activity. As already indicated, a desiger has to evaluate various alternatives at each stage and make a decision as to what promises to be the best. It should be remembered that most, if not all, design decisions are decisions under uncertainty and insufficient information. The uncertainty arises out of two sources. One, in which it is due to the reason that the required additional information depends upon the decision itself and two, in which it is due to stastically random processes.