 The dissidence continues with Lakatos’s second major contribution to philosophy, his “Methodology of Scientific Research Programmes” or MSRP (developed in detail in in his FMSRP), a radical revision of Popper’s Demarcation Criterion between science and non-science, leading to a novel theory of scientific rationality. This is arguably a lot more realistic than the Popperian theory it was designed to supplant (or, in earlier formulations, the Popperian theory that it was designed to amend). For Popper, a theory is only scientific if is empirically falsifiable, that is if it is possible to specify observation statements which would prove it wrong. A theory is good science, the sort of theory you should stick with (though not the sort of thing you should believe since Popper did not believe in belief), if it is refutable, risky, and problem-solving and has stood up to successive attempts at refutation. It must be highly falsifiable, well-tested but (thus far) unfalsified.