Abstract
This paper presents definitions prepared by a Working Group of the IEEE Joint Subcommittee on Application of Probability Methods of the Power System Engineering Committee and the Power Generation Committee, in cooperation with the Equipment Availability Subcommittee of the Prime Movers Committee of the Edison Electric Institute. The purpose of the definitions is to obtain uniformity and clarification in the reporting and analyzing performance records of generating equipment. These definitions are general and should not be construed to be reporting instructions.