This monograph provides a historical overview of Afghanistan's recent history, reviews the contemporary causes of internal instability, illustrates the international response, and analyses three existing approaches to PRTs: those of the United Kingdom, Germany and the United States. It also identifies and evaluates a number of PRT tactical and operational lessons learned. The monograph concludes by combining the pertinent lessons learned into a recommended PRT "blueprint" to meet the contemporary and evolving challenges of provincial security and reconstruction in Afghanistan.