Please visit my Understanding By Design webpages to gain a greater understanding of how the UBD design model can be used to create comprehensive study units. The principle purpose of these pages is to establish a forum for the collaborative development of middle school science units. The unit currently under development is for 6th grade Earth Science students studying the Theory of Plate Tectonics. Join in the development process by using the blog to ask questions or share activity ideas, instructional strategies, and instructional tools!