Understanding Human Development

K. Warner Schaie I am pleased to write a foreword for this interesting volume, particularly as over many years, I have had the privilege of interacting with the editors and a majority of the con­ tributors in various professional roles as a colleague, mentor, or research collaborator. The editors begin their introduction by asking why one would want to read yet another book on human development. They immediately answer their question by pointing out that many developmentally oriented texts and o