The rapidly changing state of the world makes planning in the face of complex interconnected problems a formidable challenge. Our ability to conceive adequate solutions and strategies is often undermined by our lack of understanding of the nature of problems in their wider context. The Encyclopedia of World Problems and Human Potential offers a radically different perspective to associations, policy-makers, social researchers and those concerned with development strategy. By clarifying the ways in which problems reinforce and sustain each other, the Encyclopedia shifts the level of attention from isolated problems to problem cycles, and thus to sustainable strategy cycles. This allows for a more holistic understanding of the environment in which global problems and strategies are situated.