This collection of papers is offered to “serve as a foundation point to illuminate the range of considerations and approaches” in language test construct validation research (p. 12), and it succeeds admirably. The studies represent a useful sample of validation research questions and methods. Research methods are carefully described and motivated, and many chapters have appendices containing original research materials. Discussion and interpretation of the results seem abridged in a few studies, but collectively the chapters present a clear and useful picture of the complexity of construct validation research.