Shaw, Turvey, & Mace (as cited by Greeno, 1994) later introduced the term effectivities, the abilities of the agent that determined what the agent could do, and consequently, the interaction that could take place. Perception and action were co-determined by the effectivities and affordances, which acted 'in the moment' together. Therefore, the agent directly perceived and interacted with the environment, determining what affordances could be picked up, based on his effectivities. This view is consistent with Norman's (1988) theory of "perceived affordances," which emphasizes the agent's perception of an object's utility as opposed to focusing on the object itself.