The art of thinking · 2 · Perception and attention
Affordance
Also known as: Affordances, Perceived affordance, Signifier (design)
German: Affordanz
In ecological psychology and design, an affordance is a possibility for action that an object or environment offers an agent — a handle affords pulling, a flat surface affords standing; the term was coined by James J. Gibson and adapted to design by Donald A. Norman.
- Cognitive psychology
- Perception
- Human factors
In one sentence
An affordance is a possibility for action an object offers — Gibson’s term, adapted by Norman for designed objects and signifiers.
Example
A flat cover on a machine affords putting tools down on it, even if the cover gets hot. Instructions can’t remove the affordance; they can only point it out — or the design changes.
What the research shows
For Gibson (1979) affordances are relations between an environment and an animal’s capabilities, perceived directly rather than inferred. Norman (1988) brought the term into design for the actions a designed object suggests; in 1999 he separated real affordances from perceived affordances and conventions, and in the revised Design of Everyday Things (2013) introduced signifiers for the cues that show where and how to act.
Evidence status
The ecological concept is established in perception research; its status as directly perceived (without inference) remains debated. In design the word is used loosely — often for any visual cue — which Norman himself criticized. Empirical work on object use supports that visible structure guides action, including unintended action.
How it applies
Affordances explain foreseeable behavior that no instruction prevents: people act on what objects invite. Documentation should name and counter misleading affordances where design can’t remove them, without implying that a warning replaces protective measures. The applied side is covered under usability and the gulfs of execution and evaluation; see also usability.
External references
- Norman, D. A. (1999). Affordance, conventions, and design. Interactions, 6(3), 38–43. https://doi.org/10.1145/301153.301168
- Gibson, J. J. (1979/2015). The Ecological Approach to Visual Perception (Classic Edition). Psychology Press.
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