Functional Features are features with specific design intents that are applied to other features to modify them. Characterized by inherent behaviors, they add design details by modifying shape features. Thus, each functional feature performs a function, such as creating walls, adding material to the inside or outside of a shape feature, or creating and protecting an empty space. After a feature is applied, it retains a behavior according to the feature's function and interacts with other features within the same body.
Many of the capabilities have been defined based on assembly and manufacturing processes for injection molded parts and mechanical products.