An introduction has been made on Value and Mismatches, comparatively a new concept, which clarifies the meaning of Value. The nucleolus of FAST is the correct definition of Function. This has been explained in detail through day-to-day examples. Case studies have taken a special place in this book. Salient Features: Correct definition of Function which is the key for breakthrough solutions.  Concept of different types of FAST Diagram through day-to-day examples. Academic resource for certification programme as well as on the Value Engineering subject.