The study of human behavior has long occupied a central place in the social and behavioral sciences. Understanding why individuals choose to act in certain ways-and how those actions can be anticipated or influenced-remains a fundamental challenge for researchers and practitioners alike. Among the theoretical frameworks developed to address this challenge, Icek Ajzen's Theory of Planned Behavior (TPB) stands out as one of the most influential and widely applied models for explaining and predicting human action across diverse contexts.
Originally introduced as an extension of the Theory of Reasoned Action, the Theory of Planned Behavior provides a systematic account of how attitudes toward behavior, subjective norms, and perceived behavioral control jointly shape behavioral intentions and, ultimately, actual behavior. By integrating motivational, social, and control-related factors into a coherent explanatory structure, the TPB has offered scholars a powerful tool for examining decision-making processes in fields as varied as health psychology, environmental studies, marketing, education, and public policy.
The relevance of the Ajzenian model lies not only in its conceptual clarity but also in its empirical versatility. Over the past decades, hundreds of studies have tested and refined the theory, demonstrating its applicability across cultures, populations, and behavioral domains. At the same time, ongoing debates and methodological developments have encouraged scholars to critically reassess its assumptions, extend its components, and integrate it with emerging perspectives on cognition, motivation, and social influence.
This volume seeks to provide a comprehensive exploration of the Theory of Planned Behavior, examining both its theoretical foundations and its practical implications. By bringing together conceptual discussions, empirical research, and methodological reflections, the book aims to illuminate how the TPB continues to inform contemporary investigations of human behavior.
Ultimately, the purpose of this work is not only to present the theory as a historical milestone in behavioral research but also to highlight its ongoing potential as a framework for understanding the complex interplay between individual cognition, social context, and behavioral outcomes.