Designers use many techniques to create products and solve problems. Design and development involve creating working drawings and parts lists to enable a third party to manufacture the design.
Designers should choose the appropriate technique according to the type of product they are designing and the stage they are at in the development process. For example, a designer may start off producing design ideas using freehand sketches and then move onto assembly drawings in the design development stage.
Alongside the communication techniques, designers will need to use written techniques to explain and justify their design thinking. This is often done through annotations and the analysis and evaluation of design ideas.