After reading chapter 5 and chapter 6 from the attached text book answer the following questions based on the understanding from chapters. Also provide in-text citation and proper APA reference to textbook. Total assignment minimum 500 words.

Why is it difficult to estimate mega project (i.e., costs and benefits (i.e. airports, stadiums, etc.) costs and benefits?
Define what a white elephant is in project management? Provide a real life example.
Why bother creating a WBS? Why not go straight to a project network and forget the WBS?