Psychometric Evaluation of “Teachers’ Sense of Efficacy Scale” (TSES)

Introduction: Teacher efficacy is the belief of a teacher that he can affect the behavior and academic achievement of learners. Many efforts have been made to measure teacher efficacy but there is no valid and reliable instrument to measure it in Iran. Therefore, this study was performed to translate and psychologically evaluate “teachers’ sense of efficacy scale” (TSES). Methods: This descriptive study was conducted on teachers of school of nursing and midwifery in Tehran. The questionnaire was completed by all teachers (n=140). TSES was translated and then its content, face, and concurrent validity as well as its reliability were measured using internal consistency and test re-test after two weeks. Results: Content validity index of TSES was 0.79 in part of relevancy, 0.62 for clarity, and 0.51 for simplicity respectively. Face validity of the scale was approved according to experts’ opinions and viewpoints of participants. Concurrent validity of teacher’s sense of efficacy scale was measured along with “General Self-efficacy Scale” and a value of 0.71 was calculated for their correlation. TSES scale’s Cronbach's alpha was 0.93 and 0.96 was the value attained for test re-test. Conclusion: The “Teacher Sense of Efficacy Scale” (TSES) is a valid and reliable scale for measuring the efficacy of teachers in Iran.