We present an overview of the role, benefits, and drawbacks of theory in scientific research, particularly in the social and behavioral sciences. We discuss what theory is and what it is not. We also focus on some key elements of theory such as its ability to explain phenomena at multiple parallel levels of analysis. Evolutionary theory is offered as an example that illustrates the importance of conceptual integration across different disciplines. We further describe the key characteristics of good theories, such as parsimony, depth, breadth, and coherence (both internal and external), and we encourage the use of “coherence stress-tests” to help refine theory. We then discuss 4 advantages and 10 disadvantages of using theory in social and behavioral science research. Finally, we suggest conceptual tools and provide a list of recommendations for theory-driven research. We hope this chapter will help in the complex pursuit of improving research practices in the social and behavioral sciences.

Historically, psychology has been characterized by a dichotomy between branches that focus on human nature and those that focus on individual differences. Initial “grand theories” of personality, such as those advanced by Freud, Maslow and others, were interested in universal psychological features. For Freud, the emphasis was on sexual and aggressive “instincts” and a universal sequence of psychosexual stages. For Maslow, the focus was on a hierarchy of universal psychological needs, from immediate physiological demands to “self-actualization.” Historically, personality psychology has been the primary branch that has aspired to such broad conceptualizations of human nature.