This study intended to compare the effects of prescriptive and collaborative models of observation on EFL teachers’ perception of their self-efficacy. From among 80 participants, 40 teachers, including 20 novice and 20 experienced teachers, were randomly assigned to the collaborative observation group (experimental group) and another group of 40 teachers, which comprised of 20 novice and 20 experienced teachers, were randomly assigned to the prescriptive observation group (control group). A sequential explanatory design was employed so that both quantitative and qualitative data collection/analysis procedures could be employed. The quantitative data were collected through The Ohio State Teacher Efficacy Scale (OSTES) (Tschannen-Moran & Hoy, 2001), and the qualitative data were elicited through semi-structured interviews. The results of both quantitative and qualitative data revealed (i) the significant difference between prescriptive and collaborative observation in terms of teachers’ perception of their self-efficacy, and that (ii) in the collaborative observation group, there was a significant difference between novice and experienced teachers’ perception of their self-efficacy. The study has implications for both teachers and teacher educators, suggesting that collaborative observation could enhance EFL teacher development. تفاصيل المقالة