1. INTRODUCTION

2. OBSERVATION AND DATA REDUCTION
2.1. The Herschel Orion Protostar Survey Sample
2.2. The Hubble Space Telescope Observations
2.3. The IRTF/NSFCAM2 Observations

3. SOURCE DETECTION AND POINT SOURCE CATALOG

4. THE INCIDENCE OF COMPANIONS AND ITS DEPENDENCE ON EVOLUTION AND ENVIRONMENT
4.1. The Identification of Companions
4.2. The Discovery Space of Companions
4.3. Correcting for Line of Sight Contamination
4.4. The Companion Fraction
4.5. The Companion Fraction as a Function of Environment
4.6. The Companion Probability as a Function of Environment

6. DISCUSSION
6.2. The Change of Multiplicity with Evolution
6.3. Variation in Multiplicity in Different Star Forming Environments

7. CONCLUSIONS