  An approach of this kind faces a twofold problem. If anything goes when it comes to methodology, all sorts of disciplines can achieve success without thereby achieving credibility. Consider Guru-ology, the discipline that takes its guiding questions to be those enunciated by some guru, and lays down as its methodology that acceptable answers are all and only the guru's pronouncements (perhaps assuming consistency—so let us assume for good measure that the guru is consistent and more generally probabilistically coherent). These answers could be as fanciful as you like: we leave it to the reader's imagination to devise examples of outlandish claims made by the guru. If we suppose that the guru answers each of the questions that he raises, Guru-ology is therefore progressive—it answers all the questions it raises—and it is therefore successful. But its success speaks nothing of its credibility.