THE CURRENT PAPER AIMS TO CONCEPTUALIZE SELF-EFFICACY AS AN IMPORTANT PSYCHOLOGICAL CONSTRUCT WHICH PUT FORTH MORE THAN 30 YEARS AGO BY THE MOST IMPORTANT AND HIGH CITATION LIVED PSYCHOLOGIST ALBERT BANDURA. THE CONCEPT HAS BEEN TESTED AND APPROVED BY MANY OF RESEARCHERS IN DIFFERENT DISCIPLINES AND RECENTLY IN Web ENVIRONMENT. UNFORTUNATELY, THE CONCEPT HAS NOT YET BEEN CONSIDERED IN PERSIAN LITERATURE WHILE DIFFERENT INSTRUCTIONAL AND APPLICATION CONTEXTS OF THE Web ARE RELATED AND CONDITIONED TO HUMAN BEHAVIOR. SUCH AREAS OF SUBJECTS AS INSTRUCTING INFORMATION SEARCHING SKILLS, ADAPTATION AND APPLICATION OF TECHNOLOGY, EDUCATION AND RESEARCH, ORGANIZATION AND RETRIEVAL OF INFORMATION ARE DEPENDENT TO USERS’ BEHAVIORS LIKE SELF-EFFICACY IN Web ENVIRONMENT. SOME OF THE MOST IMPORTANT AND RELATED TYPES OF Web SELF-EFFICACY LIKE IT SELF-EFFICACY, COMPUTER SELF-EFFICACY, INTERNET SELF-EFFICACY, ACADEMIC SELF-EFFICACY, RESEARCH SELF-EFFICACY, INFORMATION LITERACY SELF-EFFICACY AND Web INFORMATION SEARCHING SELF-EFFICACY ARE INTRODUCED IN THIS PAPER.