1. Introduction
2. The Completeness of the YSO Catalog
2.1. Correcting the YSO Sample for Incompleteness on the Basis of the RMEDSQ
2.2. Comparison with the COUP Survey of the ONC
2.3. Comparison with Chandra Observations of NGC 2024
2.4. The Number of Dusty YSOs Before and After Completeness Correction
3. The Densities and Spacings of Dusty YSOs in the Orion Clouds
3.1. The Distribution of YSO Surface Densities
3.2. Mapping the YSO Surface Density
3.3. Comparing the Spatial Distributions of Protostars and Pre-main Sequence Stars with Disks
4. The Demographics of Dusty YSOs
4.1. The Demographics of the Orion A and B Clouds
4.2. Comparison of the Orion A and B Clouds to Other Nearby Clouds
4.3. The Demographics of Protostars
5. The Structure of the Orion Embedded Clusters and Groups
5.1. The Global Properties of the Orion Embedded Clusters and Groups
5.2. The Internal Structure of the Three Largest Clusters
5.3. Constraints on the Ages of the Clusters from their Structure
5.4. The Structure and Dynamical State of the ONC
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