The design process for any product often varies depending on the nature and complexity of the problem to be solved. Industrial designers typically adopt their own process based on different creative problem solving methods and systematic decision making techniques in context of the problem. A recent review of methodologies described how, in a spiral process, conjecture analysis, experimental practice and trial and error in their methodology is adopted by designers (Capjon 2004). They identified that industrial design and architectural approaches (starting in the 1970’s) were in opposition to the 1960’s engineering models which were predominantly linear-sequential and theoretically driven. The design process was described as a “type-model” rather than a formulated consensus. They identified that more recently there was a mutual tendency to combine techniques. At its simplest, the design process is an iterative and cyclic process incorporating:
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