The following seven capability categories are helpful to measure a person's capability, or assess the ability level that a product demands in order to use it.

• Vision is the ability to use the colour and brightness of light to detect objects, discriminate between different surfaces, or the detail on a surface
• Hearing is the ability to discriminate specific tones or speech from ambient noise and to tell where the sounds are coming from.
• Thinking is the ability to process information, hold attention, store and retrieve memories and select appropriate responses and actions.
• Communication is the ability to understand other people, and express oneself to others (this inevitably overlaps with vision, hearing, and thinking).
• Locomotion is the ability to move around, bend down, climb steps, and shift the body between standing, sitting and kneeling.
• Reach & stretch is the ability to put one or both arms out in front of the body, above the head, or behind the back.
• Dexterity is the ability of one or both hands to perform fine finger manipulation, pick up and carry objects, or grasping and squeeze objects.

Sensory capability includes vision and hearing. Cognitive capability includes thinking and communication. Motor capability includes locomotion, reach & stretch and dexterity.