A brief history of the running of $R_{b}$

Progress in the measurement of Rb since last year¹s Moriond meeting is reviewed and compared with the previous results. The stated precisions have improved somewhat. The previous combined result, Rb = 0.2202 ± 0.0016 seemed to be in disagreement with the Electro-weak prediction of Rb = 0.2158 ± 0.0003. The more recent measurements find Rb = 0.2165 ± 0.0012, in agreement with the theory