2. Define product design features/requirements

A feature is defined as an aspect of the design that contributes to its functionality, use or personality. These characteristics can be of various kinds, and together they form the topological description of the product. There may be geometric or dimensional characteristics defined by the product's technical criteria (impact resistance, stability, precision), characteristics defined by the user's usage requirements (ergonomics), or others to express visual or tactile qualities.

Identifying design requirements means listing those that are explicit, in order to define functionalities, constraints and objectives.

For example, when designing a toy for...