The study of self-efficacy is concerned with understanding this important aspect of self and identity—people's beliefs about their personal capabilities and how these beliefs influence what they try to accomplish, how they try to accomplish it, and how they react to successes and setbacks along the way.
Gosselin, Jennifer T., Maddux, James E. "Self-Efficacy." Handbook of Self and Identity. Ed. Mark R. Leary and June Price Tangney. New York: The Guilford Press, 2003. Print.