1. Introduction
2. The Completeness of the YSO Catalog
3. The Densities and Spacings of Dusty YSOs in the Orion Clouds
4. The Demographics of Dusty YSOs
5. The Structure of the Orion Embedded Clusters and Groups
6. The SFE of the Orion Clouds and Clusters
7. The Relationship between the Orion Embedded Clusters and the Orion OB1 Association
8. The Fraction of Stars with IR-excesses
9. The Environment of Planet Formation in the Orion Molecular Clouds
10. Summary