Found on Learningforsustainability.net: "This ODI briefing paper by Harry Jones is subtitled: When is a policy problem complex, why does it matter, and how can it be tackled? It builds on ODI research over three years to review the implications of complexity for policy and programme implementation. It has three aims: to give readers the tools to decide when a problem is complex, outline why this matters, and provide guidance on how to achieve results in the face of complexity."