Recent developments in theory and phenomenology relevant to deep inelastic lepton scattering are reviewed, concentrating on the following topics: predicted behaviour of non-singlet and polarized structure functions at small x; theoretical studies of saturation and unitarity effects at small x in quarkonium scattering; renormalons and higher twist contributions; next-to-leading-order calculation...

We review several recent developments in the theory and phenomenology of deep-inelastic scattering, with particular emphasis on precision tests of QCD and progress in the detailed perturbative treatment of structure functions and parton distributions. We discuss specifically determinations of αs; higher twist contributions to structure functions and renormalons; structure functions at small x a...

We review recent results from the H1 and ZEUS experiments at HERA on charm and beauty production in ep collisions at 300 318 GeV centre-of-mass energy.

The structure of the virtual photon and its contribution to small x processes in deep inelastic scattering at HERA is discussed.