Bose-Einstein Correlations in Z Fragmentation and Other Reactions

Recent experimental studies of Bose-Einstein Correlations in Z fragmentation are reviewed in view of the need to understand their apparent suppression for pions originating from different W's. Particular features discussed are source elongation, position-momentum correlation, non-Gaussian shape of the correlator, transverse-mass dependence, density dependence and dilution, space-time shape of the emission function, neutral-pion and genuine higher-order correlations.