Professor McKenzie proposes and formulates a method composed of operational procedures designed to facilitate the evaluation of ecomic projects and policies. This method is discussed fully, illustrated by simple examples, and compared with alternative procedures. An outline of a computer program that enables readers to undertake their own calculations is included. In order to present the approach clearly, the author provides an exposition of the fundamental ideas and the main alternative approaches to the problem. These rely on various forms of index numbers and consumer surplus. However, as is well kwn, such measures are t capable of correctly ordering the various alternatives under consideration, except under highly unrealist assumptions. In this book the author suggests the abandonment of this traditional approach based on the concept of 'willingness-to-pay' or the conpensating variation. Instead, the measure that Samuelson has called the 'money-metric' should become the cornerstone of applied welfare ecomics.