Curriculum development involves cooperative planning by interested individuals to create beneficial curriculum changes. It includes preparing, planning, designing, producing, adopting, implementing, and institutionalizing curriculum. There are multiple levels of curriculum development from the state level down to the classroom level. Curriculum developers are responsible for planning, designing, and producing curriculum materials. The process involves understanding needs, developing and testing materials, and training teachers in implementation. It is an ongoing process that adapts to new pressures and innovations over time.