Issues and Perspectives; W. Faulkner, J. Fleck & R. Williams On the Economics of Expertise; P. Saviotti Gender, Expertise and Feminism; M. McNeil How Can Expertise Be Defined?; R. Hoffman Building Models of Expertise; N. Shadbolt The Structure of Knowledge; H.M. Collins Information Flow and the Nature of Expertise; J. Fleck Knowledge Flows in Innovation; W. Faulkner Trading Places: a Case Study of the Formation and Deployment of Computing Expertise; R. Procter & R. Williams The Contribution of Tacit Knowledge to Innovation; J. Senker Nuclear Weapons Experts; G. Spinardi Management and the Hybridisation of Expertise in Network Design; J. Howells 'You'll Figure it Out Between You'; G. Hardstone Automating Blood Pressure Measurements: The Division of Labour and the Transformation of Method; J. Hartland The Certainty Trough; D. MacKenzie