Policy evaluation is an important and well-established part of the policy process, facilitating and feeding back to promote the ongoing effectiveness of policies that have been implemented or anticipating policies in the making. Environmental policy is a special case, presenting new complexities uncommon to other areas, which standard evaluation tools are ill-equipped to grapple with. It is also an area that is experiencing rapid growth throughout the world and knowledge is now needed at all levels of government and in NGOs, businesses and other organizations, all of whom are required to...