A detailed investigation into a highly celebrated and important philosophical idea concerning the development of scientific knowledge: the notion of scientific revolutions. We will consider the process of theory change, whether theory choice is rational, and whether theoretical terms, such as light and space preserve their meanings across revolutions. In addition to classic work by Kuhn, we shall consider approaches that were inspired by Kuhn’s work. In particular, we will consider the approaches of sociologists of scientific knowledge. The course is taught as a seminar in which the students play an active role in presenting and discussing the readings.