"The science of medicine was the first to discover that 'an ounce of prevention is worth a pound of cure,'" Henryk Sokalski reminds us as he begins this study of a unique United Nations mission. "In the political realm, however, its full potential has yet to be realized." Sokalski, former head of the United Nations Preventive Deployment Force (UNPREDEP) in the former Yugoslav republic of Macedonia, provides the ultimate insider's look at the UN's attempt to establish a mission in this former Yugoslav republic before the imminent eruption of mass violence spilling over from neighboring Balkan states—Serbia and its overwhelmingly ethnic Albanian province of Kosovo in particular.An Ounce of Prevention—and the UNPREDEP mission itself—begins in early 1995 with a telephone call to Sokalski at his Warsaw home from UN Secretary General Boutros-Ghali, and it ends several years later in a disappointing Security Council veto of the mission's renewal. In between, Sokalski's study of this "novel experiment in UN peacekeeping" describes the mission's three "pillars" as well as contending theories on preventive diplomacy and early preventive action, contemporary Balkan history, and the daily bureaucratic and human challenges of reinventing civil society. All the while, Sokalski attempts to answer the question of whether the mission's renewed mandate could have prevented the country's recent destructive insurgency—and whether UNPREDEP's truncated success could serve as a model for future UN preventive deployments.