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The general evolution kernels of the twist 2 light-ray operators forunpolarized and polarized deep inelastic scattering are calculated in ${\calO}(\alpha_s)$. From these evolution kernels a series of special evolutionequations can be derived, among them the Altarelli-Parisi equations and theevolution equation for the meson wave function. In the case of twist 3 theresults of Balitzki and Braun are confirmed.Comment: 5 pages latex, to appear in the Proceedings of the International  Conference on Deep Inelastic Scattering, Chicago, April 1997, AI

Evolution kernels for light-ray operators: twist 2 and twist 3 contributions