“…Kennedy d identified numerous external factors that contribute to an altered perception of teacher quality such as the shape of the room, allotted time for teaching, availability of classroom materials, and additiona l work assignments beyond teaching. Additionally, contextual constraints such as lack of preparation time, participation in other non-related teaching activities, students' absenteeism, and selection of inappropriate curriculum materials for instruction can reduce the perceived quality of a teacher (Kennedy, 2010). Therefore, the certification process in countries such as the United States, in which teachers reflect on their instructional practices and then have chances to adjust their thinking during their portfolio development process is influenced by these contextual factors (Sato, Wei, & Darling Hammond, 2008).…”