The document discusses curriculum development models. It defines curriculum development as the organized preparation of what will be taught in schools and the systematic planning of courses of study. It also defines models as simplified representations that provide a structure for examining curriculum planning elements and their interrelationships. The document then describes several common models: Ralph Tyler's rational model focuses on purposes, experiences, organization, and evaluation; Hilda Taba's linear model is a 7-step process; and cyclical and dynamic models depict curriculum planning as iterative rather than linear.