Planned Behavior

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 behaviour and intention, respectively. The perceived behavioural control (PBC) construct accounted for signicant 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 behaviour than when behaviour measures were objective or observed (R2s = .31 and .21, respectively). Attitude, subjective norm and PBC account for signicantly more of the variance in individuals’ desires than intentions or self-predictions, but intentions and self-predictions were better predictors of behaviour. The subjective norm construct is generally found to be a weak predictor of intentions. This is partly attributable to a...

Abstract

The Theory of Planned Behavior (TPB) has been parsimonious, empirically supported, widely cited, most prominent, most compelling and well established model for predicting intentional behavior. Despite its comprehensive and valid prediction on behavior, TPB has received many debates and criticism on its narrow sufficiency of the three original components constructs of attitude, subjective norms and perceived behavioral control. This article discusses on the empirical support of various authors that recognized other relevant external factors to be considered in addition to the original model and considerations for future research context to enrich the existing theoretical contributions.

Introduction

The Theory of Planned Behavior or also referred to as TPB (Ajzen, 1985) has been useful and considered one of the most influential models in predicting social behaviors(Ajzen, 2011). It were found to be widely cited across domains to help in the understanding of many issues and problems of the societies(Armitage & Conner, 1999; Arnscheid & Schomers, 1996; Bansal & Taylor, 2002; Boldero, Sanitioso, & Brain, 1999;