Modern design problems are far more complicated than the traditional ones and cannot be handled by the method of trial and error because of the following reasons-
1) The traditional craftsman made things on a very small scale and thus the penalty of a wrong choice of design was limited.
2) The increasing scale of production has also introduced another complication in the process of design.
3) The rapid pace of technology change makes drastic and novel demands that cannot be met by small change.
4) The traditional designer was concerned with only one component or one product at a time.
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