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
      4.3.6.1 SPACEHAB Module
   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