Özet:

Out-of-school learning activities, defined as activities to improve students' learning experiences, scientific research, art activities, environmental activities, vocational training, social activities, and sports activities. Out-of-school learning activities help students develop self-expression, self-confidence, work habits, striving for success, and other skills. These activities also provide give students the opportunity to communicate with other people, lead in group work, resolve conflicts and learn other social skills. Among the factors that affect the success of out-of-school learning activities are the motivation of the students, the awareness of the gains that they will gain from the out-of-school learning activities and the teacher support and the teacher's self-efficacy belief. In this context, the aim of the research is to develop a valid and reliable scale that will determine the teacher's self-efficacy belief, which is one of the factors that significantly affects the success of out-of-school learning activities in science teaching. The research was carried out with 312 Science teachers working in different educational institutions in Kayseri province in the 2021-2022 academic year. Survey model, one of the quantitative research methods, was used in the research. Within the scope of validity, face validity, criterion validity, construct validity and content validity studies were carried out in the study. Within the scope of reliability, item discrimination index and alpha internal consistency coefficient were calculated. The data obtained because of the study were analyzed by exploratory factor analysis (EFA) with the SPSS 25.0 package program. At the same time, confirmatory factor analysis (CFA) was performed with the LISREL 8.7 package program. In addition, the results obtained from the study include that the sample size is sufficient, KMO value and Bartlett test results are high.

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