This text investigates the foundational principles, historical development, and ethical applications of psychological testing and assessment. Robert G. Gregory provides a comprehensive overview of the field, drawing upon decades of psychometric research to explain how standardized tests are constructed, validated, and interpreted. The work serves as a bridge between theoretical statistical concepts and the practical demands of clinical and educational settings.

This volume is regarded as a standard academic resource for students and practitioners seeking a structured introduction to psychometrics. The material provides a dense, methodical examination of the field that prioritizes technical accuracy and historical context over simplified summaries.