This authoritative Handbook comprehensively examines the current status and future directions of model-based systems in decision support and their application to sustainable development planning. It begins with a comprehensive review of model-based applications in sustainable development planning, paying particular attention to environmental disaster, ecosystem management, energy, infrastructure development, and agricultural systems, amongst other contemporary issues. Conceptual and policy oriented papers then debate the future directions of model-based sustainable development planning. Taking account of the fact that sustainable development planning is multidimensional by nature, the contributors concede that a single exemplary model does not exist. The aims of the stakeholders, along with preferences and priorities surrounding the planned objectives determine the ways and means of sustainable development planning. A number of tools - from simple intuition based approaches to sophisticated mathematical modelling - are therefore utilised within the Handbook. An important feature of the work is the emphasis on Decision Support Systems (DSS) and Group Decision Support Systems (GDSS) approaches - it is argued that these are natural and appropriate for sustainable development planning. Given the rise in prominence of sustainable development planning in recent years, this Handbook will be invaluable to a wide-ranging audience including NGOs, planners, consultants, policymakers, and academics.