The 6th edition emphasizes that accuracy is a function of project definition , not effort. You can spend millions refining a Class 5 estimate, but it will never become a Class 1 until the scope is frozen. Most owners make the mistake of demanding precision before definition exists.
Cost engineers do not work in a vacuum. The 6th Edition integrates cost engineering into the Project Management Body of Knowledge (PMBOK). skills and knowledge of cost engineering 6th edition pdf