8. Regarding Estimates and Budget, Part 4, Section G: A. What are the four different types of estimates that Ward defines? At what point in the process is each used/does each come into play? B. What is contingency and why is it typically added to the estimate (or, per Ward, "must" be added)? C. Why is it important to implement an estimate trend programme when going through the precon process with a client? D. At what point does the estimate become/convert to the project budget?