The document discusses several models of the curriculum development process, including those proposed by Ralph Tyler, Hilda Taba, and Galen Saylor and William Alexander. All the models utilize the key processes of curriculum planning, designing, implementing, and evaluating. Tyler's model and the Saylor/Alexander model are deductive, starting broadly and becoming more specific, while Taba's is inductive, starting with specifics. The models provide a linear order and sequence for progressing through the different steps of curriculum development and combine both a development scheme and instructional design.