Measurements of B-d oscillations from CDF, LEP and SLD experiments are revi
ewed and their world averages are presented. Time-dependent and time-integr
ated mixing measurements are combined with direct reconstruction of specifi
c final states to obtain the best estimate of the B species production frac
tions from b-quark hadronization. Finally, searches for B-s oscillations at
CDF, LEP and SLD are reviewed, presenting the combined result. An emphasis
is put on recent results, as well as perspectives for the near future.