This is the 123rd volume of the Jossey-Bass quarterly thematic journal New Directions for Evaluation, an official publication of the American Evaluation Association. The journal publishes empirical, methodological, and theoretical works on all aspects of evaluation. Each issue is devoted to a single topic, with contributions solicited, organized, reviewed, and edited by a guest editor or editors. Issues may take any of several forms, such as a series of related chapters, a debate, or a long article followed by brief critical commentaries