This document provides an introduction to analyzing primary and secondary sources using the OPVL (Origin, Purpose, Value, Limitation) framework. It defines primary sources as those created during the event by eyewitnesses, and secondary sources as those created later by historians using primary sources. The document explains how to identify a source as primary or secondary, and provides examples of each. It then demonstrates how to analyze a sample primary source poem using the OPVL framework to understand the source's origin, purpose, value and limitations for historians. The document provides guidance on properly answering each OPVL section.