The concepts of professional learning and problems of practice align closely to my own beliefs as a former science teacher and current principal. Unlike professional development, professional learning is not an “event”. Professional learning is an ongoing process of learning by practice, observation, and refinement….much like addressing a scientific hypothesis over time. No longer do I advocate sending my staff to professional development conferences to find a “one size fits all” approach to an instructional dilemma: been there, done that, it doesn’t work. I now tell my staff that the answers to improving student achievement exist right within the walls of our own school. While we may research techniques available online or in educational journals, the solutions only begin to take place when we learn and experiment together as colleagues.