Abstract
Weber's 'science as a vocation' has often been viewed as a therapeutic concept with no functional significance in the fully bureaucratized and professionalized modern science. However, development in the philosophy of science in the last century, especially the Kuhn thesis of the discontinuity of scientific progress and the Duhem-Quine thesis of underdetermination, shows that Weber's distinction between science as a vocation and science as a profession (career) can potentially answer one of the oldest questions in science studies: What makes scientific breakthroughs possible?