摘要：Self-efficacy-sufficiency is defined as the belief of a person about how well s/he can perform the actions to deal with the problems which s/he confronts. The belief of self-efficacy determines whether the person will manifest the right behaviour when confronted with a problem, and how much effort s/he will put in and how insistent s/he will be to deal with the problem.The process of learning based on individuals' learning from their own lives and experiences, and reflecting on what is learned from the experience is called experiential learning, and is used widely as a method of personal development and learning. Outdoor education based on the principle of learning by experience acts as a catalyst for getting the participants to leave their comfort zones through a set of unusual activities carried out in a different atmosphere, and for encouraging them to change and to understand themselves as well as others.The study was in pre-test-post-test design as one group and data was collected by survey. The sample of survey is the same with target population of the study and composed of 90 university students ( 50 men – 40 women), who play an active role in the Community of Mountain Climbing and Outdoor Sports and who volunteer for outdoor education. Outdoor education lasted one day and was designed in accordance with the literature. The outdoor education programme consisted of an opening meeting in which participants discussed the things to be done, and topics such as the comfort zone, learning by experience, and transfer of behaviours, two high-level activities, and an initiative activity based on communication and problem solving.The Self-efficacy Scale (SES) developed in 1982 by Sherer et al. was used for measurement. The Scale was adapted to Turkish and tested for validity and reliability by Gözüm and Aksayan (1999).This study aims to determine the effects of a one-day outdoor activity on the perceived level of self-efficacy of the participating students. The statistical analyses conducted have shown that the outdoor activity did not lead to a significant difference as regards the independent variable of gender (p>.05), yet it had a significant positive effect on the perceived self-efficacy of the participants (p.05), ancak katılımcıların öz-etkililik algılarında anlamlı pozitif etkisinin olduğu (p<.05) tespit edilmiştir.Sonuç olarak açık alan etkinlikler bütününün, katılımcıların öz-etkililik algılarını olumlu etkilediği söylenebilir.
