Additionally, even though other fields, such as art, make progress - it is not scientific progress because there are always competing schools. Science is unique because when operating under a paradigm there is a shared set of beliefs and practices that makes science insular and particulary adept at solving problems. Next, the domination of science by textbooks also makes science appear to progress. Whenever there is a crisis and a new paradigm emerges, the new textbooks assemble the body of scientific knowledge in an organized linear way. The following characteristics of the scientific community also make progress possible.
Science is largely independent of the state.
Scientists as a group are uniquely competent. The community of scientists is particularly well defined. And the problems and solutions offered are nearly universally accepted. Kuhn brings things to a close by noting that science does not bring us closer to the truth. Oh well, we can't have everything.