With the mix of different actors and organizations taking part in complex peace operations, the concept of integration has become increasingly relevant, as evidenced by the lively debate among theoreticians and practitioners within the peace operations community. Integration, in its narrow sense, is often seen as difficult and even undesirable. However, if understood as part of a larger trend toward strengthening peace operations, integration can be said to reflect the importance of cooperation and coordination among all actors involved in peace operations. Increasingly, military, police and humanitarian actors find themselves, sometimes sharing but more often, co-habiting a common space in complex peace operations. Faced with diverse perspectives, lack of clarity regarding roles and responsibilities, and the need to identify lessons learned, they are finding new and innovative ways to collaborate and synchronize their actions. While revised operational principles, guidelines and doctrines are carefully crafted to incorporate the multiplicity of perspectives found in intervention efforts, more is required to enhance our understanding of current approaches to today's complex operations. This issue of The Pearson Papers thoughtfully discusses and analyzes the theme of cooperation and coordination through a selection of four major articles and one dispatch from the field. The first article, The Implications of Regional Peace Operations on examines the effects of a shift from multinational to regional peace operations on the United Nation's ability to maintain international peace and security. While some positive outcomes are identified from this shift, ultimately, the argument remains that enhanced and concerted coordination amongst all actors involved in peace operations is critical to achieve long-term peace and security. Coordination becomes even more critical where leadership is dispersed, efforts are fragmented and there is disagreement on priority access to scarce resources and facilities. This is reflected in the remaining articles and dispatch from the field, which discuss the theme of cooperation and coordination among diverse actors in the context of Afghanistan. Afghanistan is an interesting prototype of UN-mandated but coalition-led intervention, which not only disrupts our traditional "linear" understanding of peace processes, but pushes the boundaries in terms of how we view, understand, and work in integrated environments. Given this background, the articles examine the challenges and effectiveness of civil-military interaction in Afghanistan and the advancement of a "whole of government" approach from a coalition, Provincial Reconstruction Team (PRT), and humanitarian perspective. Lastly, the dispatch from the field provides a credible account of the nature of the challenges of cooperation and coordination on the ground. -- Publisher's Description.