This document discusses IT metrics and provides guidance on defining, categorizing, and validating them. It explains that IT metrics help achieve organizational objectives like ensuring system availability and managing costs. Metrics are defined as part of a process improvement cycle to assess current performance and guide improvements. Common metrics categories include quality, performance, and trends. The document cautions against common mistakes like measuring the wrong things or extending metrics to individuals. Examples of specific IT service metrics are provided like ticket volume, on-time resolution, and first-time fixes.