This document discusses different types of curriculum designs including subject-centered, learner-centered, and problem-centered curriculums. It also describes several influential curriculum development models such as Tyler's model from 1949, Taba's grassroots approach, and the Saylor, Alexander, and Lewis model. The Oliva model provides a process for schools to develop curriculums that meet the specific needs of their student communities. Key aspects of these models include identifying student needs, formulating objectives, organizing content and learning experiences, and determining evaluations.