Functional affordance

A design concept introduced in receptive design methodology that describes what a product or interface enables a user to do based on specific body functions, rather than general ability assumptions. Unlike traditional affordances (which describe what an object's properties suggest about how it can be used), functional affordances explicitly map design features to the body functions they require — such as grip strength, visual acuity, or cognitive load — making accessibility requirements visible and designable. This approach helps designers move beyond disability categories to consider the functional diversity of all users and identify where breakdowns in task completion may occur.