Towards a realistic composite model of quarks and leptons

Within the context of the 't Hooft anomaly matching scheme, some guiding principles for model building are discussed with an eye to low-energy phenomenology. It is argued that Λsub(ch) (chiral symmetry breaking scale of the global color-flavor group Gsub(CF))proportionalΛsub(MC) (metacolor scale) and Λsub(gCF) (unification scale of the gauge subgroup of Gsub(CF))< or approx.Λsub(ch). As illustrations of the method, two composite models are suggested that can give rise to three of four generations of ordinary quarks and leptons without exotic fermions. (orig.)