As authors, we chose the subject for this book because of what early childhood teacher candidates told us about their confusion between the theory they were taught in college methods classes, and, the teaching practices they often experienced during the Practicum field placement. We became interested in this subject because the teacher candidates were questioning, as good teacher candidates do, a troubling disconnect between early childhood theory and associated practice in classrooms. We were motivated to write this book because we wanted to share our model of professional development, designed to support both pre-service teacher candidates and, in-service educators together, during the Practicum field placement. Our lead author secured a grant to investigate these concerns and to implement a new professional development model designed to overcome them. The substance of this book reminds all of us, that in early childhood education, educators’ change through professional development, for improved practice that benefits children’s learning, is a constant.