This book on assessing writing is designed for teachers, school leaders, and evaluators. It begins with a collection of assessment practices that will increase teachers' efficiency and effectiveness as they guide students in learning how to think and write successfully. The second section includes step-by-step procedures, prompts, and rubrics for conducting on-demand, timed writing assessments, either for diagnosis of students' skills or for analysis of instruction. The final section explains how to develop and measure interrater reliability, the extent to which assessors agree on the quality of student writing-a critical component for any faculty that seeks to increase the efficacy of their teaching. Whether readers wish to assess the thinking and writing of students in one class, one school, or a whole district, this book will show them how.