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 – quick to achieve, so as not to interfere with the creative process;

 – done at the right time, sketches are useful when a designer needs to externalize a mental representation, for a reflective conversation, or to communicate their ideas, preferably in the upstream phases of design;

 – inexpensive, because it is a matter of allowing for mistakes, corrections, changes of ideas, adjustments;

 – disposable, the investment in a sketch is the concept and not the sketch itself (normally, several sketches are made quickly and all of them are kept, which implies that one should never find a sketch by itself);

 – understandable, because the communicability of the idea depends on it;

 – characterized by the freedom of the gesture, neither tightened nor too precise;

 – minimalist, only what is important to the concept, because technical details are distractors that tend to interfere with the ideation work (Rodgers et al. 2000);

 – with the appropriate degree of development; the sketch’s degree of development should match the idea’s degree of development so that designers are not fixated on details of the idea rather than its central features;