This document provides information on pain assessment. It discusses the different types of pain, factors that affect pain perception, and why pain should be measured. It describes several tools that can be used to measure pain in adults and children, including numerical rating scales, visual analogue scales, the FLACC scale for young children, and the Wong-Baker FACES scale for older children. Guidelines are provided on how to assess pain, including taking a detailed pain history and evaluating location, intensity, aggravating/relieving factors. It emphasizes the importance of pain assessment and outlines when and how often it should be conducted.