Though essentially all major social scientists since the late 19th century have accepted that the discipline faces challenges that are different from those of the natural sciences, the ability to determine causal relationships invokes the same discussions held in science meta-theory. Positivism has sometimes met with caricature as a breed of naive empiricism, yet the word has a rich history of applications stretching from Comte to the work of the Vienna Circle and beyond. By the same token, if positivism is able to identify causality, then it is open to the same critical rationalist non-justificationism presented by Karl Popper, which may itself be disputed through Thomas Kuhn's conception of epistemic paradigm shift.