Summary: Principles of Psychological Testing is a comprehensive guide aimed at enabling readers to evaluate psychological tests of any type and interpret test results accurately by understanding test construction principles, psychological knowledge of behavior being measured, and familiarity with available instruments. The text emphasizes principles of test construction and acquaints readers with major types of available tests, discussing examples and providing a classified list of over two hundred tests with yearbook references. The third edition puts more "psychology" into "psychological testing" to combat existing confusion about test score interpretation, aiming to enhance knowledge about contemporary testing. Covering functions and origins, nature and use, interpretation of test scores, and specific tests in various fields, the book offers insights into the most popular psychological tests with updated editions and new methodologies to enhance understanding of contemporary testing practices and principles.