Visualisations range from annotated small scratch sketches to detailed renderings that demonstrate how a concept may be constructed, its components, form, structure, functions, ergonomic features or proportions. They allow the designer to think through, depict and document the design within their mind. Initial visualisations are typically in response to the initial research conducted whereas developed visualisations are used to communicate the details of the design to a client or user.
In each of the visualisations the designer can use a variety of freehand or instrumental drawing systems to communicate the design intent or feature they are trying to think through.
Scratch sketches are small rough sketches that are used to respond to research or quickly explore a wide variety of ideas within a short period of time. These drawings extremely simple and are often only for the use of the designer.