The nature of the concept of sustainability makes it difficult to coordinate and monitor the implementation of sustainable development in the formulation of effective policy. The International Law Association at its meeting in New Delhi in 2002 offered a set of seven Principles of International Law Relating to Sustainable Development as a definitive tool to inform the formulation of policy and potentially legal arrangements. This article describes a research project by the World Future Council that used these principles as the basis for a methodology to assess and evaluate how a range of policies might contribute to sustainable development in the interest of future generations. Three ―"best" policies on food security are evaluated and their common characteristics are identified. The article finally discusses how policy assessments based on principles accepted internationally might contribute to accelerated, effective and coherent implementation of sustainable development, even where the prevailing institutional approach treats ecological, social, economic and cultural issues as separate factors.