This article examines whether there are changes in students' teaching practices as a result of their experiencing an overseas professional development course (PDC); the process of any such changes; and whether any changes found are sustainable in the long term. Three forms of data gathering are used, lesson observation, in-depth interviews, and email correspondence, in order to compare and capture the fluidity of changes over time. Results indicate that the teachers' fundamental belief in certain concepts of teaching and learning did indeed change, but ultimately certain teaching practices could not be altered in the teachers' home country due to the reality of its assumptions about teaching. (Contains 4 tables and 2 figures.)