11. Outline three ways the 3-D model database can be used in the implementation phase. 12. What kinds of 3-D model derivatives might be produced as part of the design process? 13. What is the difference between conventions and standards? 14. Describe two reverse engineering techniques. 15. Describe two different rapid prototyping technologies. 16. Explain why an enterprise might want to store data in an off-site data warehouse. 17. Describe two different VR display techniques.