ABSTRACT
Chapters 1 through 13 of this volume document an eventful past, a vibrant present, and an intriguing future for validity generalization. The aim of this chapter is to highlight some important themes running through this book and the literature on which these chapters are based. The aim is not to provide a comprehensive history of validity generalization (VG), a complete picture of its present status, or a detailed road map of where this field is heading; chapters 1 through 13 do a better job than could possibly be done here. Rather, the aim is to extract and discuss some of the key issues in the development and application of VG analyses, and to make some suggestions about important issues that remain to be resolved.
