Comments on Recent Progress in Few Particle Physics

Status of the present understanding of multiparticle reaction mechanism is summarized. Lesson derived from the studies of the reaction D(p,2p)n is that mechanism can be very imoortant even if not easily noticeable in a particular representation. E.g. even a deep minimum is understood as a destructive interference between neutron-proton and proton-proton quasifree scattering. Information about nuclear interaction derived from few particle studies is discussed. The correct neutron-neutron effective range parameters are those extracted from the D(??-,??)2n reaction. Values extracted from the D(n,p)2n reaction are influenced by the three body force. Evidences for the three body force are summarized.