On Your Mark asserts the need to align grading and reporting practices to truly reflect what students are learning in K 12 classrooms. The changes this book outlines might be controversial adjusting any system that has been in place for centuries will cause tension yet we owe it to our students to make sure grades accurately communicate their progress and help them improve. Rather than continuing down the wrong path out of delusion, fear, or tradition, we must use research to boldly move forward and better serve our students. The chapters first present changes that K 12 teachers and administrators can accomplish with a modest effort. They then lead up to the larger undertakings that demand a significant transformation of grading practices. Specifically, chapter 1 guides readers as they clarify the purpose of grades and craft a vision statement that aligns with this purpose. In chapters 2 and 3, readers will question the accuracy of percentage grades, plus and minus grades, and half-grade increments. Chapter 4 disputes grade distribution, such as curving grades, and highlights this practice s flaws. Chapter 5 examines class ranking and offers alternatives, and chapter 6 examines the practice of assigning a single letter grade to reflect a student s quarter or semester progress for a given subject. Readers will scrutinize mathematical algorithms and other practices that render grading inaccurate in chapters 7 and 8. Finally, Guskey closes the book with a summary of his key points.