Chapter 1 introduces the Handbook by reviewing the historical and contextual factors surrounding the development of international psychological and educational testing. This Handbook provides such a review in six sections, covering (a) overview and historical context, (b) domains of testing and assessment, (c) settings, (d) special populations, (e) methodological advances, and (f) problems and challenges. Within each of these sections, the chapters address the unique problems, issues, and challenges related to testing from an international and global perspective. Recognizing the importance of cultural and international contexts to a true and accurate psychology, the authors have described how cultural, economic, political, and social factors in different countries frame the science and practice of testing and assessment. As this is an international Handbook, the contributors have also been selected to represent not only different domains and settings of psychological testing, but also different geographical regions of the world.