For such an important concept, the question "What is Design?" appears to yield answers with limited usefulness.When I was in college for 1Y0-A08 exam I often participated in design classes also.Dino Dini states that the design process can be defined as "The management of constraints". He identifies two kinds of constraint,70-620 negotiable and non-negotiable. The first step in the design process is the identification, classification and selection of constraints. The process of design then proceeds from here by manipulating design variables so as to satisfy the non-negotiable constraints and optimizing those which are negotiable. It is possible for a set of non-negotiable constraints to be in conflict resulting in a design with no solution; in this case the non-negotiable constraints must be revised. For example, take the design of a chair. A chair must support a certain weight to be useful,70-431 and this is a non-negotiable constraint. The cost of producing the chair might be another. The choice of materials and the aesthetic qualities of the chair might be negotiable.