Glatthorn's naturalistic model of curriculum development contains 8 steps: 1) Assess alternatives, 2) Define the course, 3) Develop support, 4) Build knowledge, 5) Design units, 6) Plan learning experiences, 7) Develop assessments, and 8) Create learning scenarios. It is a non-scientific model that emphasizes flexibility, child-centered learning, and evolving the curriculum based on needs and interests rather than predefined objectives.