Interconnection phenomena in WW events at LEP2

Interactions between the products of the hadronic decays of different Ws in WW pair events can occur at several stages: from the colour rearrangement between the quarks coming from the primary branching, to the gluon exchange during the the parton cascade, to the mixing of identical pions due to Bose-Einstein correlations. Besides the intrinsic interest of their study related to the understanding of the multiparticle production mechanisms, these phenomena can affect the ultimate accuracy in the W mass measurement by LEP 2. The status of the experimental analysis on interconnection effects between W pairs decaying hadronically is reviewed in this paper. For what is related to Bose-Einstein interference, only the results from ALEPH and DELPHI are presented, being L3 and OPAL discussed in another contribution to this conference