Hi Nathaniel, astropy is an example of a project that does essentially all discussion of its "Astropy Proposals for Enhancement" on github. I actually like the numpy approach of sending anything to the mailing list that deserves community input (which includes NEP by their very nature). I don't think it has to be either/or, though; maybe the preferred approach is in fact a combination, where the draft is send to the mailing list, initial general comments are incorporated, and then discussion moves to github when one is past the "general interest" stage. When exactly this happens will be somewhat subjective, but probably is not important to nail down anyway. All the best, Marten p.s. I think the __array_ufunc__ discussion indeed showed that github can work, but only once the general ideas are agreed upon - the initial discussion become hopeless to follow (though I'm not sure a mailing list discussion would have been any better).