People’s past actions are often a good index of their future behavior (Eagly & Chaiken, 1993).

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In many instances, the consistency of a person’s behavior over time is the result of personality and external motivational factors.  that are common to the situations in which the behavior occurs.  A causal influence of one behavior on another can also occur. Sometimes, for example, people who have performed a certain behavior might later think about its possible consequences, and these post behavior cognitions could guide their future actions. In other instances, people might use their past behavior as an index basis for their later decisions subconscious, they might simply assume that the conditions that led to their earlier behavior exist in the present situation as well and might repeat the behavior without bothering to verify this assumption.(Taylor - 1975)

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In this, we try to eliminate the first cause of that behavior and decision made at the time.