Copied from a comp.lang.lisp post by Ray Dillinger. Also see PPR:LispSchemeDifferences ,common-lisp. What Common Lisp has got: What Scheme has got: Much better developed standard SLIB + SRFI's + a hundred little libraries libs that each do things differently and aren't very standardized. (Arguably Scheme is the place where new ideas fight for mindshare and prove themselves - but the fights and the