This standards identifies terms and concepts pertinent to the resolution of the Year 2000 issue and provides definitions of these terms and description of these concepts. This standard provides a common lexicon with definitions and descriptions for use in addressing Year 2000 issues. Revision Standard - Inactive-Withdrawn. This standard revises IEEE Std 2000.1-1998. It provides a detailed set of definitions. In addition, it addresses calendar information that is helpful in understanding the timeline issues surrounding the year 2000 rollover. The definitions section remains the core of the standard. With this expanded set of definitions, the standard now addresses areas that are relevant to both engineering and business environments. An increased degree of specificity has been added to the definition of Year 2000 compliance,making it more precise in its meaning and application.