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– suggesting rather than telling, because the sketch is not the technical specification document that appears much later in CAD; suggesting leaves the user of the sketch a share of deductions to make, which may be conducive to finding solutions;
– intentionally ambiguous, as one should not, in seeking to represent a specific concept on an object, fix all of the other characteristics of that object. It is better to remain ambiguous about those features of the object that are not central to this sketch (Tseng and Ball 2011).
1.4.4. The phases of ideation
Figure 1.2.
1.4.5. The right tools at the right time
Robertson and Radcliffe (2009) have highlighted risks associated with using CAD software too early in the design process. It will tend to circumscribe thinking, create early fixation or “bounded” ideation. With CAD software, the designer does not want to back out of an idea because it involves relatively heavy technical actions. In other words, CAD can become an “innovation killer” if it is used too early and designers must be trained in terms of method to avoid this risk.