This article deals with a staff developer's concerns about Bill Stewart's staff retreat, and how these concerns create opportunity and obligation. The author presents views from a superintendent and two staff developers on the staff retreat. Aside from these, the author talks about a superintendent named Darlene Preston, and her course of action. Preston is planning a new training session for teachers in her district. Her first step is to design a session for teachers on differentiation. As she reviews all the materials, information, and resources, she carefully selects those that would meet the course outcomes. She designs examples of differentiated lessons using the district curriculum and texts to use as models in the training. The author discusses the things that influence Preston in designing the course.