  Using the theory talks at ISMD2010 as a guidance, I present a personal review
of our current understanding of multiparticle interactions in QCD. For more
clarity, I separately consider hard, semi-hard, and soft interactions, and I
devote most of the space to those phenomena for which progress has been
recently made from first principles. Also, priority is given to processes which
are directly relevant for QCD studies at the LHC, notably to forward particle
production and ultrarelativistic heavy ion collisions.
