As some of you know from previous posts, Sam Scott and I have written a paper on Splitting Concepts, forthcoming in Philosophy of Science.  When it comes out, our paper will be followed by a response by Edouard Machery, entitled How to Split Concepts (posted with his permission).  He did a good job in resisting our arguments in most of the places where he and we disagree.  I was not convinced by his reply, but I was impressed.

Update: I concur with Edouard's comment to this post:  It would be very interesting to know what others think about this issue.