Can Composite Quarks and Leptons Be Realistic?

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Abstract
Various approaches of lepton/quark composite model are examined in view of the conditions which are required by phenomenological facts and summarized in the Introduction. It is argued that a large mass scale, which is necessary to suppress anomalous gauge couplings, should be introduced without violating the flavor gauge symmetry. It is left to be a serious problem to search for the reason assuring the existence of massless bound states with desired flavor quantum numbers. Comments are made on the reasonings proposed so far, i.e., 't Hooft anomaly condition and supersymmetry.

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