First published by UCL Press in 1996, with subsequent editions in 2001 by Psychology Press and a third edition in 2020 by Routledge co-authored with C.A. Lewis, "An Introduction to the Construction of Psychological Tests and Scales" has become a definitive guide in the field of psychometrics. This text has evolved over the years to incorporate new methodologies, technologies, and insights into psychological measurement, maintaining its status as an indispensable tool for anyone involved in designing or critiquing psychological instruments.

The book's structure systematically guides the reader through each phase of test development, from identifying the need for a new measure to the complex process of validation. Initially, it lays out the foundational concepts of psychological measurement, including reliability, validity, and norms. It then progresses to practical advice on item writing, scale construction, and the use of various statistical analyses for test evaluation.

A distinguishing feature of this work is its clear, step-by-step approach, making complex statistical concepts accessible to those without an extensive background in statistics. The second edition introduced updates on computer-based testing and the use of item response theory, reflecting technological advancements in assessment. The third edition, co-authored with Lewis, further expands on these themes, including discussions on cross-cultural psychometrics and the impact of digital technology on test administration and interpretation.

One of the book's strengths is its emphasis on ethical considerations in test construction, addressing issues like cultural bias, fairness, and the implications of testing on different populations. This ethical dimension ensures that readers are not only equipped to create effective tests but to do so responsibly.

Moreover, the text does not shy away from the practical challenges of test development, offering advice on navigating the real-world complexities of creating scales that are both scientifically sound and practically applicable. It includes case studies and examples from various psychological domains, showing how theoretical principles apply in practice, from clinical psychology to educational assessment.

For academics, this book serves as a teaching tool for courses on psychometrics or research methods, while for practitioners, it's a guide to developing or choosing appropriate psychological measures. The evolution of this text over nearly three decades reflects the changing landscape of psychological testing, making it a living document that adapts to new methodologies and ethical standards in psychological research and practice.

In summary, this book stands out for its comprehensive coverage, clarity, and commitment to both the art and science of psychological measurement, ensuring its place as a foundational text in psychometrics.