Russell Lincoln Ackoff is a thinker whose ideas and activities have had a global impact. A recognized authority in the field of operations research and systems theory, he has published more than 200 papers and nineteen books in the field. In addition, he has served as consultant to a list of corporations that reads like a Who's Who of American businesses. This volume pays tribute to Ackoff's distinguished career. In Planning for Human Systems, editors Jean-Marc Choukroun and Roberta M. Snow have brought together essays from a number of Ackoff's former students, colleagues, friends, and coworkers. Contributors include such notables as Michel Chevalier, C. West Churchman, Thomas A. Cowan, Eric Trist, Ian I. Mitroff, Stafford Beer, and Ignacy Sachs. The papers are divided into five main sections. The first deals with Ackoff and his relationship with Anheuser-Busch, and the second deals with his intellectual roots in the American pragmatic tradition. The third section demonstrates how systems thinkers have incorporated Ackoff's ideas in their own work. The fourth section shows the influence of Ackoff's thinking on decision making and problem solving, while the final section offers a reassessment of current approaches to systems planning on the national level. In addition, the editors have provided a general introduction, as well as introductions to each of the five sections. Planning for Human Systems will be of interest to students and scholars of operations research and systems theory.