With over 50 years of research validation, curriculum-based measurement continues to expand across schools and districts due to its proven effectiveness, ease of implementation, and alignment within multi-tiered systems of support (MTSS). The revised and updated third edition of the gold-standard ABCs of CBM delivers essential guidance as educators increasingly rely on data-driven instruction for universal screening, progress monitoring, and instructional decision making. In a convenient large-size format, the book accessibly covers the "whats," "whys," and "how-tos" of CBM across reading, spelling, writing, and math, with detailed protocols for administration, scoring, and standards within MTSS. New to This Edition: Updated throughout with 10 years of advances in administration, scoring, and reporting. Chapter on preschool CBM for early intervention. Cutting-edge multilingual CBM resources for diverse populations. Social-emotional/behavioral CBM measures. This book is in The Guilford Practical Intervention in the Schools Series, edited by Sandra M. Chafouleas. See also the authors' ABCs of Curriculum-Based Evaluation, which also supports MTSS while utilizing CBM.