Introduction: The Sociological Turn.- The Pseudo-Science of Science?.- The Strengths of the Strong Programme.- The Strong Program: A Dialogue.- Problems of Intelligibility and Paradigm Instances.- The Rational and the Social in the History of Science.- A Plague on Both Your Houses.- Two Historiographical Strategies: Ideas and Social Conditions in the History of Science.- The Role of Arational Factors in Interpretive History: The Case of Kant and ESP.- On the Sociology of Belief, Knowledge, and Science.- Scientific and Other Interests.- The Sociology of Reasons: Or Why "Epistemic Factors" are Really "Social Factors".