Abstract
Composite-component duality appears to be the characteristic feature to assure approximate proton stability within a vast class of subcomponent models for quarks and leptons. We discuss six models which allow for the observed quark-lepton spectrum: two models have two color triplets and two singlets as subcomponents, bound by a subcolor SU(7) or SU(9); two models have a color triplet, an antitriplet and two singlets, and again subcolor SU(7) or SU(9); two models have two triplets, two antitriplets and four singlets, and subcolor O(15) or O(17).
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