Action (philosophy)

An action is something which is done by an agent. In common speech, the term action is often used interchangeably with the term behavior. In the philosophy of action, the behavioural sciences, and the social sciences, however, a distinction is made: behavior is defined as automatic and reflexive activity, while action is defined as intentional, purposive, conscious and subjectively meaningful activity. Thus, throwing a ball is an instance of action; it involves an intention, a goal, and a bodily movement guided by the agent. On the other hand, catching a cold is not considered an action because it is something which happens to a person, not something done by one.

Other events are less clearly defined as actions or not. For instance, distractedly drumming ones fingers on the table seems to fall somewhere in the middle. Deciding to do something might be considered a mental action by some. However, others think it is not an action unless the decision is carried out. Unsuccessfully trying to do something might also not be considered an action for similar reasons (for e.g. lack of bodily movement). It is contentious whether believing, intending, and thinking are actions since they are mental events.

Some would prefer to define actions as requiring bodily movement (see behaviorism). The side effects of actions are considered by some to be part of the action; in an example from Anscombe's manuscript Intention, pumping water can also be an instance of poisoning the inhabitants. This introduces a moral dimension to the discussion (see also Moral agency). If the poisoned water resulted in a death, that death might be considered part of the action of the agent that pumped the water. Whether a side effect is considered part of an action is especially unclear in cases in which the agent isn't aware of the possible side effects. For example, an agent that accidentally cures a person by administering a poison he was intending to kill him with.

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