Efficacy of the Theory of Planned Behaviour
E ffi cacy of the Theory of Planned Behaviour: A meta-analytic review Armitage, C. J., & Conner, M. (2001). Efficacy of the theory of planned behaviour: A meta ‐ analytic review. British journal of social psychology , 40 (4), 471-499. The Theory of Planned Behaviour (TPB) has received considerable attention in the literature. The present study is a quantitative integration and review of that research. From a database of 185 independent studies published up to the end of 1997, the TPB accounted for 27% and 39% of the variance in behavior and intention, respectively. The perceived behavioural control (PBC) construct accounted for signi. cant amounts of variance in intention and behaviour, independent of theory of reasoned action variables. When behaviour measures were self-reports, the TPB accounted for 11% more of the variance in behavior than when behaviour measures were objective or observed ( R 2 s = .31 and .21, respectively). Attitude, subjective norm ...