In The Human Experiment: Success or Failure?, author James M. Jeffrey asks what may be the most important question of our time. Having been taught the human costs of war and environmental destruction, how can we stop these tremendous threats to humanity? The answer, according to Jeffrey, lies in recognizing the history of the human Cultural Process by which we shape our thinking and behavior. Drawing on his personal biography as a combat veteran and a broad knowledge of history, Jeffrey describes how early humans began an Experiment in Cooperative Living. He chronicles how each generation used this Cooperative Process to develop the shared ideas that we call Culture, adapting to the conditions of their time. Then he describes how modern humans unknowingly altered the Process, putting us on the self-destructive course that we find ourselves on today. How can we restore our Cultural Process, correct our course, and make our Human Experiment successful again? James M. Jeffrey’s exploration of this question is critical for the future of humanity.