Bose-Einstein correlations in Z fragmentation and other reactions

Recent experimental studies of Bose-Einstein Correlationsin Z fragmentation are reviewed in view of the need to understand their apparent suppression for pionsoriginating from different W's. Particular features discussed are source elongation, position-momentum correlation, non-Gaussianshape of the correlator, transverse-massdependence, density dependenceand dilution, space-time shape of the emission function, neutral- pionand genuine higher-order correlations.