This document provides an overview of Understanding by Design (UbD), a framework for designing curriculum units that focuses on designing assessments before lessons in order to ensure students achieve desired learning outcomes. It describes the three stages of backward design: 1) identifying desired results like understandings, essential questions and knowledge/skills; 2) determining appropriate assessments like performance tasks; and 3) planning learning experiences to prepare students for the assessments. The goal is for students to develop a deep understanding of key concepts and be able to transfer their learning to new situations.