The document discusses several models of curriculum development, including the Taba model, Ralph Tyler's model, Kerr's model, and Wheeler's cyclic model. The Taba model takes a grassroots approach with teachers designing curriculum for their students initially before a broader design. Tyler's model outlines four basic principles: educational purposes, experiences, organization, and evaluation. Kerr and Wheeler argue curriculum development is not always linear and can involve interactions between different elements like objectives, content, experiences, and evaluation.