First visual contours of the design, a sketch.
“(…) if we think of design as a sequence of iterative phases that progress towards final production, we are then able to identify an open or fuzzy phase of design. In this we contrast a divergent conceptual design ideation with a more convergent, specific and detailed design phase. We do this as much to contrast the different aims of design at these different phases of the process, as to highlight the kinds of design work involved or tools used at any given stage.”