This book raises concerns about English as foreign language (EFL) teachers' perceptions of task-based language teaching (TBLT) and the impact on their classroom practices to identify challenges and possibilities in TBLT implementation. From the data collected in the survey of 80 secondary school EFL teachers from 30 different secondary schools of Bangladesh, the findings indicate that most EFL teachers hold positive attitudes toward TBLT execution but that there exist constraints like the large-sized class and difficulty in evaluating students' task-based performance. As such, implications are proposed based on the findings to help teachers administer TBLT more effectively in the future. To identify the perception of task based language teaching and ways to implement it in second language learning is the main aim of this study. Like many other methodological innovations, Task-Based Language Teaching (TBLT) has been applied to many English language curriculums across Asia.This book reports of an in-depth case study into the perception and implementation of a group of secondary English teachers in regard to the innovative national curriculum in Bangladeshi secondary schools.