# Adaequatio (Adequateness)
> *Adaequatio*: the understanding of the knower must be _adequate_ to the thing to be known.
SEE ALSO: [[Affordances]], [[Requisite Variety]]
*Adaequatio* is a perspective on human perception and knowledge offered by philosopher E.F. Schumacher. He suggests that we can only perceive and know something if we have an adequate capacity (see a related idea in [[Requisite Variety]]):
> Nothing can be known without there being an appropriate “instrument” in the makeup of the knower. This is the Great Truth of *“adaequatio”* (adequateness)…the understanding of the knower must be _adequate_ to the thing to be known. (Schumacher 1977)
This idea is also closely related to the concept of [[Affordances]], which also suggests that any animal is in conversation with its environment, and that the action-potential any environment "affords" will depend on the qualities and capacities of the animal involved.
- Schumacher, E. F. _A Guide for the Perplexed_. 1st ed. New York: Harper & Row, 1977.
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