Refining and petrochemical project management personnel, most without estimating background, are required to understand, analyze, and determine validity of complex cost estimates prepared by others. How is the non-estimator, already overloaded with work to be done, ever to find the time much less the required resources to become sufficiently competent to meet this requirement? This book is specifically designed and written as a desktop resource for this individual. In addition to presenting an organized approach to analyzing cost estimates, summarized results of decades long historical cost data collection is presented, providing needed assistance to answer the crucial question of "is this estimate reasonable?"