THE LINKED DIPOLE CHAIN MODEL FOR DIS

The Linked Dipole Chain Model provides an interpolation between the re gions of high Q(2) (DGLAP) and low x moderate Q(2) (BFKL) in DIS. It i s a reformulation and a generalization of the results obtained by Ciaf aloni, Catani, Fiorani and Marchesini, and it gives a unified treatmen t of ''normal DIS'', boson-gluon fusion events and hard subcollisions in resolved photon-proton scattering. Thus the formalism provides a co mplete picture which incorporates all hard or semihard hadronic intera ctions in a simple way, which is suitable for a Monte Carlo treatment of both structure functions and final state properties. We also discus s non-leading effects which significantly reduce the increase of the s tructure function for very small x-values.