4. Reference Mission Development
   4.1. Mission Design - First Flight
   4.2. Spacecraft Design
   4.3. Systems Design
      4.3.1. Guidance, Navigation, and Control
      4.3.2. Communications Systems
      4.3.3. Electrical Power Systems
      4.3.4. Thermal Control Systems
      4.3.5. Life Support Systems
      4.3.6. Pressure Vessels
      4.3.7. Structures and Mechanisms
      4.3.8. EVA Systems
      4.3.9. Propulsion
      4.3.10. Mission Equipment
      4.3.11. Test and Verification
      4.3.12. Spacecraft Video Equipment
      4.3.13. Materials and Processes
      4.3.14. Crew Systems
   4.4. Spacecraft Production
   4.5. Ground Support
   4.6. Flight Crew
   4.7. Mission Operations
   4.10. Design Requirements and Specifications