Transdisciplinarity provides an essential context for understanding some of the most important, complex, and difficult issues we face, whether in environmental protection, maintaining our health care systems, drafting new laws, formulating public policy, accommodating religious and cultural pluralism, or dealing humanely and respectfully with an ageing population. It responds to the need to cross boundaries in order to embrace the ideas of all disciplines that may be relevant to these questions. Successful transdisciplinary endeavours depend on developing methodologies that can be used to...