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Constraining Approach

The constraining method is in many ways similar to the combinatorial approach. It is useful when the client is not sure of the decision criteria. It also requires the designer to identify the most significant assumptions and their ranges. However in this method, the designer would systematically and experimentally test the sensitivity of the assumptions’ ranges, narrowing them to the point where one or a small number of design options can be developed.
An advantage of this method is that it allows the designer to retain good partial solutions and avoid errors on the most important issues. It is a method which can be efficiently used in a circumstance where a committee or direct public participation is expected to produce the design.

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