1. How are 3D impressions created? What surfaces are they most common? 2. Why is casting important? Are there things that a cast captures that can't otherwise be captured? 3. How are impressions typically made? What part of the shoe strikes the surface first? 4. List the various types of casting materials that have been used in crime scene investigations over the years. 5. List at least 4 criteria that casting materials should meet. 6. What based materials are also referred to as "plaster"? 7. How should the amount of water to casting powder be pre-measured? By what? 8. List the five basic things needed in your casting kit. 9. What is a fixative? What is a release agent? 10. What are the five stages in the setting process of a cast? 11. Why should you always photograph your cast after it has been obtained? 12. Who introduced the first recorded shoe sizing system? In what year? 13. List the five current shoe sizing systems used by most of the world 14. What two devices are used to measure shoe sizes? How are each of them measured? 15. Why is it difficult to determine someone's shoe size even with all