  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 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 hadronically decaying is reviewed in this paper.
