This chapter describes three theories such as the theory of reasoned action (TRA), the earlier theory of planned behavior (TPB), and the later reasoned action approach (RAA), and the correlational and experimental evidence supporting them. It provides critiques aspects of these theories, and reviews potential additions to the theories and moderators of relationships among theory components. The TRA, TPB, and RAA suggest that the key proximal determinant of action/behavior is one's behavioral intention to engage in that behavior. Behavioral intention represents a person's motivation in the sense of her or his conscious plan, decision, or self-instruction to exert effort to perform the target behavior. These are usually tapped by items assessing likelihood of intending to perform the behavior. The sufficiency of the TRA/TPB has received some considerable attention with a number of additional predictors being proposed.
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