EN
Self-efficacy conceived as a belief in man's ability to organize and perform activities that are necessary to achieve results becomes an important factor in human performance. The nature of this construct is composed of the internal resources in terms of skills and resources from the environment, leading to understand human as a social being. Based on the need for differentiation of this concept to other constructs and understanding its importance in the individual system activities, this study describes self-efficacy in terms of its definition and sources. Emphasis on clarification of understanding of self-efficacy as an important factor of human behavior may lie in its definition and operational model clearer substantiation, rather than in using this term in the narrow context of specific research.