This foundational text by Dr. Jaafar Al-Mayahi offers a comprehensive exploration of psychological measurement and educational evaluation. It delves into the core principles and methodologies of psychometrics, covering essential topics like test construction, validity, reliability, and item analysis. The book provides practical guidance on applying these concepts in educational settings, examining various assessment tools and techniques. It serves as a vital resource for students, educators, and researchers seeking to understand the theoretical underpinnings and practical application of effective assessment and evaluation in education and psychology, bridging the gap between theory and practice.