Popper's theory of demarcation has set the standard of falsifiability for all sciences. But not all falsifiable theories are part of science and some tests of scientific theories are better than others. Popper's theory has led to the banning of metaphysical and/or philosophical anthropological theories from science. But Joseph Agassi has supplemented Popper's theory to explain how such theories are useful as research programs within science. This theory can also be used to explain how interesting tests may be found. Theories (...) of rationality may be used to illustrate this point by showing how they fail or succeed in producing interesting and testable hypotheses in the social sciences. (shrink)