1) The document discusses different curriculum design models including subject-centered, learner-centered, and problem-centered designs.
2) Subject-centered design focuses on content and divides curriculum into subjects like reading, math, and science. Learner-centered design emphasizes the needs and interests of students and includes child-centered and experience-centered approaches.
3) Problem-centered design organizes learning around solving real-world problems. It can focus on life situations, issues in the local community, or philosophical problems.