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The Theory of Planned Behavior (TPB) has received considerable attention in the literature of social cognitive studies. The present study is a quantitative integration and review of the studies in that field. Through a meta-analysis on 120 independent studies published up to the end of 2011, this ...

The Theory of Planned Behavior (TPB) has received considerable attention in the literature of social cognitive studies. The present study is a quantitative integration and review of the studies in that field. Through a meta-analysis on 120 independent studies published up to the end of 2011, this study found that the TPB accounted for 27.9% and 31.5% of the variance in behavior and behavioral intention, respectively. The perceived behavioral control (PBC) accounted for the significant amounts of variance in both intention and behavior, which was added in the former model, the theory of reasoned action. The results also found that the subjective norm was a weak predictor of behavioral intentions. This finding is consistent with the results of previous meta-analytic studies conducted in the U.S. and implies that TPB needs to improve the measurement and to add another normative components. Based on the findings of the present meta-analytic review, this study discussed the future directions in which current TPB research can be taken forward.

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