1. Introduction  
2. Observations  
2.1. Instrumentation  
2.2. Survey Design and Strategy  
3. Data Processing  
3.1. Motivation  
3.2. Master Calibration Frames  
3.3. Science Data Calibration  
3.4. Astrometric Calibration  
3.5. Tile and Orion A Mosaic Assembly  
3.6. Photometric Calibration  
3.7. Final Catalog Assembly  
4. VISTA Orion A Survey Data Products  
4.1. VISTA Orion A Source Catalog  
4.2. VISTA Orion A Mosaic L-RGB  
5. Young Stellar Populations Toward Orion A  
5.1. Orion A Population  
5.2. Foreground Population  
6. Summary