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A simplified taxonomy of the most important philosophical positions regarding free will.

The problem of free will is the problem of whether rational agents exercise control over their own actions and decisions. Addressing this problem requires understanding the relation between freedom and causation, and determining whether or not the laws of nature are causally deterministic. The various philosophical positions taken differ on whether all events are determined or not—determinism versus indeterminism—and also on whether freedom can coexist with determinism or not—compatibilism versus incompatibilism. So, for instance, hard determinists argue that the universe is deterministic, and that this makes free will impossible.

In the scientific realm, the principle of free will may imply that the actions of the body, including the brain and the mind, are not wholly determined by physical causality.