Integrated assessment is a trendy phrase that has recently entered the vocabulary of folks in Washington, DC and elsewhere, The novelty of the term in policy analysis and policy making circles belies the longevity of this approach in the sciences and past attempts at their application to policy issues, This paper is an attempt at providing an overview of integrated assessment with a special focus on policy motivated integrated assessments of climate change, The first section provides an introduction to integrated assessments in general, followed by a discussion of the bounds to the climate change issue, The next section is devoted to a taxonomy of the policy motivated models, Then the integrated assessment effort at Carnegie Mellon is described briefly, A perspective on the challenges ahead in successful representation of natural and social dynamics in integrated assessments of global climate change is presented in the final section.