This document introduces SOLO (Structure of Observed Learning Outcomes), a taxonomy for understanding the stages of learning. It describes the five levels of the SOLO taxonomy from prestructural to extended abstract. With SOLO, teachers can design learning intentions, success criteria, and provide feedback to students to help them progress from surface to deep understanding. While similar to Bloom's Taxonomy, SOLO focuses more on describing the learning outcome itself rather than knowledge. The document provides examples of how to introduce SOLO to students and tips for getting started with implementing it.