The document discusses the principles of backwards design for developing lesson plans. It explains that backwards design involves 3 stages: 1) identifying the desired results and standards, 2) determining acceptable evidence of student understanding, and 3) planning teaching and learning experiences to meet the objectives. The process begins with defining the enduring understandings and goals that students should retain after the lesson. These understandings are more conceptual and transferable than specific facts. The document provides examples of distinguishing between important knowledge, skills, and understandings for students to gain from a lesson.