Colour reconnection and bose-Einstein effects in the hadronic W-pair decays at DELPHI

The data collected by the DELPHI detector at LEP at centre-of-mass energy of 183 GeV were used to study the possible presence of interference in the hadronic decays of WW pairs. The multiplicity, inclusive distributions and the correlation funtions for like sign pairs were measured in WW fully hadronic events and compared with WW semileptonic events were no interference occurs. No effect is observed at the present level of statistics.