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This book explores the notion of 'validity evaluation' as a means for helping educators to ensure the utility and worth of their assessment practices. With a particular focus on foreign language testing, the author challenges assessment traditions and argues for a fundamental reconceptualization of assessments and their validation in language teaching and other educational settings. Following a critical review of test validity standards and methods within educational measurement, the author then proposes a comprehensive alternative approach to validation based upon program evaluation methodology. A report of a multi-year case study completes the volume, providing in-depth analyses of how validity evaluation methods were applied by foreign language educators in meeting the assessment needs of a German program at a US university.