Abstract
This essay describes the value and validity of public dialogue on science?related issues. We define what is meant by ?dialogue?, the context within which dialogue takes place in relation to science, and the purposes of dialogue. We introduce a model to describe and analyse the practice of dialogue, at different stages in the development of science, its applications and their consequences. Finally, we place the practice of dialogue on science?related issues in relation to the wider political process and draw out implications for scientists in particular