The document discusses three models of curriculum development:
1. Ralph Tyler's model emphasizes the planning phase and considers the school's purposes, educational experiences, organization of experiences, and evaluation.
2. Hilda Taba's model takes a grassroots approach, beginning with learner needs and moving through formulation of objectives, selection of content, organization, experiences, and evaluation.
3. Galen Saylor and William Alexander's model involves specifying goals and objectives, designing curriculum, implementing instructional plans, and conducting evaluation to determine if goals were met.
All three models utilize the basic steps of planning, designing, implementing, and evaluating the curriculum.