Abstract
Certain types of composite models of quarks and leptons are expected to lead to low-lying excited states of quarks and leptons, possibly of masses as low as 20 GeV. Production cross sections of such excited states in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation and in inelastic lepton-nucleon scattering are calculated. Questions of observability of excited but confined quarks are discussed. It appears that excited quarks and leptons can be best seen in annihilation experiments at c.m.-system energies close to the mass of the ${Z}^{0}$ boson.
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