Drawing for the team
When designers sketch it is usually a private function in which they give some shape to their first thoughts, but the freehand sketch is also an efficient way of communicating with other members of the design team: colleagues and consultants.
Such drawings tend to be slightly more formal than a sketch that is made for personal consumption, because the designer’s instinct will be to resolve ideas a little more before they are offered for discussion. They will be more intricate because they have to make their points clearly, and they will lack much of the exuberance of the spontaneous sketch because they must be as unambiguous as possible.
It makes sense to observe drawing conventions when making even the roughest sketches, ...