This textbook is a practical guide to language test development for classroom use, educational program evaluation, placement at instructional levels, measurement and research. It has served for many years as a classic classroom textbook at both graduate and undergraduate university levels. This new edition makes it available once again at low cost for student use. It provides useful information about reliability and validity estimation and about test and questionnaire development for a variety of educational and evaluation purposes. It includes information useful for the development of both paper-and-pencil and computer-adaptive measurement instruments.