This issue discusses ways of constructing, organizing, and managing arguments for evaluation. Not focued solely on the logic of evaluation or predictive validity, it discusses the various elements needed to construct evaluation arguments that are compelling and influential by virtue of the truth, beauty, and justice they express. Through exposition, original research, critical reflection, and application to case examples, the authors present tools, perspectives, and guides to help evaluators navigate the complex contexts of evaluation in the 21st century. This is the 142nd issue in the New Directions for Evaluation series from Jossey-Bass. It is an official publication of the American Evaluation Association.