Efficacy of the theory of planned behaviour: A meta-analytic review
Armitage and Conner pool 185 independent studies of the theory of planned behaviour published up to 1997. The theory explained 27 per cent of the variance in behaviour and 39 per cent in intention; perceived behavioural control added to both, subjective norm was generally a weak predictor of intention, and behaviour variance explained was higher with self-report than with objective or observed measures. British Journal of Social Psychology 40(4), 2001; authors Christopher J. Armitage and Mark Conner.
Armitage and Conner pool 185 independent studies of the theory of planned behaviour published up to 1997. The theory explained 27 per cent of the variance in behaviour and 39 per cent in intention; perceived behavioural control added to both, subjective norm was generally a weak predictor of intention, and behaviour variance explained was higher with self-report than with objective or observed measures. British Journal of Social Psychology 40(4), 2001; authors Christopher J. Armitage and Mark Conner.
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Armitage, C. J., & Conner, M. (2001). Efficacy of the theory of planned behaviour: A meta-analytic review. British Journal of Social Psychology, 40(4). doi:10.1348/014466601164939 https://doi.org/10.1348/014466601164939