This study was initially the author's Ph.D dissertation written at the University of Texas at Austin in 1995 entitled "A New Approach to Sensitivity Analysis of the DEA Models and their Applications to Ranking and Productivity Growth." An updated preface and a general index were added for this book which was originally published in 1996. The primary objective of this study is to demonstrate a new method available to management scientists for evaluating the organizational efficiency performance and analyzing how stable the evaluations are to the sample data collections.