Revised and expanded with the latest tools and strategies, this concise book offers guidance for effectively conducting social, emotional, and behavioral assessments in today's K-12 schools. The expert authors present foundational knowledge on assessment and data-based decision making at all levels--whole schools, small groups, or individual students--within a multi-tiered system of support (MTSS). Chapters describe when, why, and how to use extant data, systematic direct observation, direct behavior rating, and rating scales. In a large-size format for easy photocopying, the book includes reproducible forms and templates. Purchasers get access to a Web page where they can download and print the reproducible materials. New to This Edition *Reflects a decade of change in behavioral assessment, including an increased focus on screening and progress monitoring. *Includes current knowledge about the defensibility, usability, repeatability, and flexibility of each method. *Focuses on social, emotional, and behavioral assessment within MTSS frameworks. *Chapter on practical applications, featuring in-depth case studies. *Reproducible tools now available online. This book is in The Guilford Practical Intervention in the Schools Series, edited by Sandra M. Chafouleas.