Indicator development as 'boundary spanning' between scientists and policy-makers

In sustainability impact assessments the development of widely accepted indicators that structure the subject area and provide the framework for assessing sustainability impacts is clearly important. We argue that the development of sustainability indicators in science-based initiatives works across the science/policy interface where social and natural scientists as well as stakeholders and policy-makers both translate concepts and ideas to each other and thus make value judgments about the selection of indicators and related sub-classes. This explains why pure scientific indicator initiatives based on simple 'knowledge transfer' models are unlikely to succeed. Instead, sustainability indicator development requires a 'knowledge transaction model' which spans the boundary between the scientific and the political domains.