This timely volume assesses NATO's current accomplishments, continuing challenges, and potential pitfalls. Leading international scholars and policymakers explore three key themes influencing NATO's future: transatlantic relations, the debate over enlargement, and the organization's new functions. Weighing the fate of an alliance poised for renewal or decline, the contributors offer informed analysis and discussion of an organization that has changed profoundly over the past five years and continues to evolve in the face of an uncertain global environment.