Colour reconnection studies in WW events at LEP                                
  
Measurements of the event properties of hadronically decaying Ws in W+W-       
events observed in the OPAL detector at LEP will be presented.  In addition    
to studies of charged particle multiplicity, fragmentation functions           
and rapidity, observables based on the particle flow will also be              
presented and compared with models of colour reconnection.                     
The predicted effect of colour reconnection on OPAL measurements of M_W is     
also quantified in the context of models studied.                              
  
 Parallel session :5                   
 Plenary  session :6a