I do not like composite models of quarks and leptons; they seem to me just as decomposition of phonemes: it can be done, but it is not linguistic. Still, I could be wrong. Another PF inhabiatant, Carl Brannen, likes them enough to have developed his own model. And I'd guess he is not the only one around here. So I would like to use this thread first to review the work already done and published on "preon" models. Some papers are old, thus sometimes it helps to search for them in spires instead of ArXiV because, beside extensive citation search, Spires keeps pointers to the KEK, Fnal and CERN preprint services. You can go to Spires from any ArXiV:hep- preprint by clicking the SLAC-SPIRES HEP tag. The main spires trick is "find a Einstein and date 1905" A first clue, because it is recent, is Sverker Fredriksson Preon Prophecies by the Standard Model, hep-ph/0309213. It points us to papers from Harari, Shupe, and Fritzsch. The one from Harari is in KEK scans, at http://ccdb3fs.kek.jp/cgi-bin/img_index?7905333 I believe to remember that Harari work was about three non commuting preons with nice jewish names.