This document summarizes a research study that investigated Japanese second language teachers' understanding and implementation of communicative language teaching (CLT). The study used interviews, classroom observations, and surveys to understand how teachers defined CLT and applied it in their classrooms. The study found that teachers' views and practices of CLT were influenced more by their own experiences than by academic literature on CLT or their teacher training. Teachers developed their own conceptions of how to teach foreign languages based on personal ideas and experiences over time.