... this is so funny. When I saw it, I thought Monk had been unfair not to recognize Wittgenstein's works as 1 or 2. But I see, at the opening, he defends the list on other grounds: Wittgenstein occupies nearly everything else! (You know you are good when your personal and cultural musings end up being one of the greatest books of the century). I still say the 1 and 2 slot are not "right." But I at least could understand one saying that neither of Tractatus and PI would be "number 1" in this sense. Wittgenstein himself post-1930 (and sooner, I imagine) never considered any of his works to be "final" or "without flaw" or "perfectly in shape." And so perhaps a finished work in the mind of the author could be a criterion. Also, note that Monk says that PI is HIS (Monk's) number-1. So the failure to offer it a universal-1 shows he has some community-criteria in mind. FWIW, I think one could make arguments for On Certainty and would have to give serious thought even to various of Wittgenstein's published manuscripts\typescripts. http://www.guardian.co.uk/books/2001/nov/01/bestbooks.philosophy (I'm going to start forwarding more stuff in here from Ray Monk. He's just excellent). Regards and thanks. Dr. Sean Wilson, Esq. Assistant Professor Wright State University Personal Website: http://seanwilson.org SSRN papers: http://tinyurl.com/3eatnrx Wittgenstein Discussion: http://seanwilson.org/wiki/doku.php?id=wittrs ;