Educational Measurement has been the bible in its field since the first edition was published by ACE in 1951. The importance of this fourth edition of Educational Measurement is to extensively update and extend the topics treated in the previous three editions. As such, the fourth edition documents progress in the field and provides critical guidance to the efforts of new generations of researchers and practitioners. Edited by Robert Brennan and jointly sponsored by the American Council on Education (ACE) and the National Council on Measurement in Education, the fourth edition provides in-depth treatments of critical measurement topics, and the chapter authors are acknowledged experts in their respective fields. Educational measurement researchers and practitioners will find this text essential, and those interested in statistics, psychology, business, and economics should also find this work to be of very strong interest. Topics covered are divided into three subject areas: theory and general principles; construction, administration, and scoring; and applications. The first part of the book covers the topics of validation, reliability, item response theory, scaling and norming, linking and equating, test fairness, and cognitive psychology. Part two includes chapters on test development, test administration, performance assessment, setting performance standards, and technology in testing. The final section includes chapters on second language testing, testing for accountability in K-12 schools, standardized assessment of individual achievement in K-12 schools, higher education admissions testing, monitoring educational progress, licensure and certification testing, and legal and ethical issues.