Interior design is critically important to customer satisfaction because the customer interacts in a very personal way with the inside of the vehicle. Interior designers face the difficult challenge of blending aesthetic, functional and ergonomic features, often within tight constraints.

Aesthetically, the interior of a vehicle must harmonize with its exterior theme. Functionally, a vehicle interior has to meet many requirements, such as federally-mandated safety standards. Ergonomically, the customer's interaction with the vehicle must be natural and allow for quick response. Controls must be placed within easy reach, instruments clearly visible and placement of components logical. Interior design themes are developed in the same basic fashion as exterior design themes. A complex process of sketching, feedback, and refinement leads to the development of interior clay models.