This book offers 50 practical ideas for teachers to use for their professional development. The tips cover a wide range of activities that can be carried out individually or in collaboration with others, including self and peer observation, journal writing, on-line forums, classroom research, action research, team teaching, lesson review, materials review, lesson study, mentoring, peer coaching, reading groups, and workshops. The Tips can be used by both novice and more experienced teachers and are intended to provide a basis for teachers to review the current state of their professional learning and to develop and implement goals for their development.