Extending the Theory of Planned Behavior: Evidence of the Arguments of its Sufficiency
Norazlan Hasbullah, Prof. Dr. Abdul Jumaat Mahajar, Dr. Mad Ithnin Salleh

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.

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