To date, studies on reflection seem to lack concern for in-service teacher development. This article proposes a new EFL reflective practitioner development model (RPDM) for an in-service program that is not only based on the principles of reflection, but that also measures teachers' reflective and self-efficacy development.Focusing on the improving practitioners' reflective abilities, the model emphasizes building self-efficacy and delineates the program' s procedure to achieve these goals. The model was tested by collecting quantitative and qualitative data. The findings suggest that the model would be effective for educators to use as it facilitates and improves teachers' abilities to reflect and their overall self-efficacy. The continuous development of societies requires a growing need for individuals who are well prepared for their profession. In order to ascertain whether individuals are well prepared, measurement and evaluation procedures can be used. Although the literature does not contain any research measuring the reflective development of language teachers in EFL programs, extensive research does exist on language teacher education, reflection, and teacher beliefs as independent areas (Avalos, 2011;Craig, 2013;Peacock, 2009;Riley, 2009;Schunk & Pajares, 2002). In this way, although the effect of a program focusing on improving teachers' reflective behavior and selfefficacy remains under-researched, these areas should be subject to critical scrutiny and well-organized study. As Brown (1995) pointed out, evaluation is 'the heart that connects and provides blood to all the other program elements.' In this regard, the primary focus of this study is to measure language teachers' reflective development using a new model of reflective practitioner development, abbreviated RPDM, based on a quasi-experimental design so as to ensure and maximize teachers' self-efficacy and reflection skills. The model emerging from "experiential learning" (Kolb & Fry, 1975) strives for two main constructs: reflection and continuous development in order to provide the best possible practices in language teachers' professional development. As is known, not every teacher is able to acquire or continue to develop the knowledge and skills that they need or which are required by the institution in which they are employed.
KeywordsReflection here plays a major role because the nature of practice is such that improvement can only be fostered depending on how the professional understands the concept of self and the nature of the practical (Calderhead, 1987). Moreover, reflection enables teachers to make careful considerations about what their experience are all about and to form a habit of continually learning from their own experiences by framing problems of practice, by critiquing and reframing problems within broader perspectives, and by taking action that is fostered by such reframing (Kayapinar, 2013). In this sense, teachers may become reflective practitioners, adopting a reflective stance toward their practice as a means...