  The connection between multiparton interaction, diffractive processes and
saturation effects is discussed. The relation of the rise of the gluon density
at small longitudinal momentum fractions x with the occurrence of saturation,
diffraction and multiparton interaction is being studied both experimentally
and theoretically. We illustrate key ideas underlying recent progress, and
stress the role of different theoretical approaches to small-x QCD evolution in
investigations of multiparton interactions.
