what recommendation did don norman have to improve a design model when designing for the disabled??

best answer
uxdesign.cc › general-principles-of-design-donGeneral principles of design — Don Norman’s principles uxdesign.cc › general-principles-of-design-don CachedAffordances — the relationship between the properties of an object and the capabilities of the agent to recognize and sense as to how the object could possibly be used. Constraints — the design concept of constraining refers to determining ways of restricting the kind of user interaction that can take place at a given moment. Mappings — refers to the relationship between controls and their effects in the world. This is especially useful in designing control systems. For example the arrangement of lightswitch that corresponds to the order of the lightbulbs gives us the intuition and ease of control for ourselves. Visibility. The more visible functions are the more likely users will be able to know what to do next. Visibility is the generalization of signifiers as it pertains not only to instructional symbols but graphic design elements as well15.