Affordances: Four Points of Debate

In this article, attention is given to 4 issues regarding affordances. The first relates to the ontological status of affordances: Affordances do not have to be perceived to exist. The second concerns whether affordances are necessarily related to (one's own) actions. The third considers the relation between affordances and effectivities. Finally, the nesting of affordances is addressed, as is whether some particular level of description should be considered privileged. Some issues seem settled; others require more theory and experimentation.