This guide provides the following: (a) Describes how to apply American National Standard for Classification for Software Anomalies, ANSI/IEEE 1044-1994; (b) Describes what is and is not complaint customatization by providing examples of use and customization and providing example definitions of classification terms and situations where different definitions might be applicable; (c) Provides some additional explanation of the "supporting data items" from ANSI/IEEE 1044; (d) Provides examples of measures that can be derived from the classification data; (e) Provides examples of where those metrics are useful; and (f) Describes methods for analyzing the classification data.