The theory of planned behavior includes the basic ideas of the theory of reasoned action but adds another important variable to the model.This variable is

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The theory of planned behavior includes the basic ideas of the theory of reasoned action, which suggests that behavior is determined by the intention to perform the behavior and the attitudes and subjective norms towards the behavior. However, the theory of planned behavior adds the variable of perceived behavioral control, which refers to a person's beliefs about their ability to control the outcome of the situation. This variable is important in determining whether or not a person will perform a behavior, even if they have positive attitudes and subjective norms towards the behavior.

The Theory of Planned Behavior Includes the Basic Ideas of the Theory