As the introduction notes, no corner of the globe is exempt from the scourge of deadly and durable armed conflict. Yet in the face of seemingly intractable conflicts, state and nonstate parties are time and again able to reach a negotiated compromise that leads to a durable peace. At other times, unfortunately, the process is rushed or misconceived and the peace is short-lived or never reached. In both cases, there are lessons to be learned with regard to how to solve the various puzzles and associated conundrums faced by parties seeking to design resilient peace agreements and establish a durable peace.