This manual is intended for use as a training publication and as a guide for investigators working wage compliance cases. The manual is divided into 10 sections. They contain a comprehensive review of the pay board regulations which remain in effect for those industries under mandatory control and serve as guidelines for the voluntary sector. To completely develop cases, investigators must have a thorough understanding of the computations prescribed by the pay board regulations and the criteria for exceptions. Exceptions and exemptions are discussed in chapter 1. Wage and salary investigation worksheet samples are presented in chapter 2. Computations are discussed in chapter 3. The manual also contains sections discussing Phase IV regulations, the November 1971 recodification, forms S82 and S102, and a sample case file and problems. (Author)