The purpose of this essay is to present and analyse the basic assumptions of Leszek Nowak’s conception of the unity of science. According to Nowak, the unity of science is manifested in the common application of the method of idealisation in scientific research. In accordance with his conception, regardless of the discipline they represent, researchers go through the same stages in building a theory. Two key ones among them are: introducing idealising assumptions into the representation and then their concretisation. In (...) this view, idealisation is the basis of the scientific method, while other cognitive procedures complement it. Nowak’s conception has particular relevance in the context of the dispute between naturalism and anti-naturalism and in the context of the continuing rift between social scientists and natural scientists. It calls into question the anti-naturalist thesis of the ontological uniqueness of social sciences and the resulting methodological consequences. I argue that Nowak’s conception is a cognitively valuable contribution to the contemporary epistemology of science, but it also has weaknesses, mainly due to the limitations of applying the idealisation-concretisation scheme in research practice. For it turns out, as I point out in this essay, that many idealising assumptions are not subject to concretisation and that concretisations do not always condition an increase in the explanatory and/or predictive power of the representations. (shrink)

Idealized explanations are the one subtype of incomplete explanations which is most frequently used in the empirical sciences and at the same time least analyzed in philosphy of science. It is argued that idealized explanations, while having the same logical structure as adequate explanations, differ from these in the mode of validity of the argument. Whereas an adequate explanation shows why the occurrence of some event had to be expected, an idealized explanation argues that a certain event would occur if (...) certain conditions were fulfilled. Idealized explanations are heuristic devices which, in the long run, ought to be transformed into adequate explanations. (shrink)