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2 - Changing Behavior Using the Theory of Planned Behavior

from Part I - Theory and Behavior Change

Published online by Cambridge University Press:  04 July 2020

By
Icek Ajzen  and
Peter Schmidt
Edited by
Martin S. Hagger ,
Linda D. Cameron ,
Kyra Hamilton ,
Nelli Hankonen  and
Taru Lintunen
Martin S. Hagger
Affiliation:
University of California, Merced
Linda D. Cameron
Affiliation:
University of California, Merced
Kyra Hamilton
Affiliation:
Griffith University
Nelli Hankonen
Affiliation:
University of Helsinki
Taru Lintunen
Affiliation:
University of Jyväskylä
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Summary

The theory of planned behavior (TPB) provides a framework for designing and evaluating behavior change interventions. The theory postulates a sequence of effects from behavioral, normative, and control beliefs regarding the behavior to attitudes and subjective norms, which – moderated by perceived behavioral control – lead to the formation of a behavioral intention. Intention is proposed to be carried out to the extent that the behavior is under volitional control. For an intervention to motivate the desired behavior, it must influence behavioral, normative, and/or control beliefs; and, to support implementation of the behavior, it must ensure sufficient perceived and actual behavioral control. Practical steps for the design and evaluation of a TPB-based intervention are described. These include research to elicit accessible beliefs; construction and validation of a TPB questionnaire; confirmation of the structural TPB model; and a preliminary test of the intervention’s ability to change the targeted variables. In the final phase, the intervention is administered and its effects are evaluated by examining changes in behavior and its theoretical determinants. Research has supported the predictive validity of the TPB and its utility as a framework for behavior modification. Future research is needed to identify additional effective strategies to change TPB determinants.

Keywords

attitudesintentionssubjective normsperceived behavioral controlreasoned actionintention-behavior relationssalient beliefs
Type
Chapter
Information
The Handbook of Behavior Change , pp. 17 - 31
Publisher: Cambridge University Press
Print publication year: 2020

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