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The actual limit of the unitarity condition of the first row of the CKMmatrix |V_ud|^2+|V_us|^2+|V_ub|^2=1+\Delta_CKM is \Delta_CKM=-0.0001(6). In2010 the same was \Delta_CKM=+0.0001(6). Despite the only difference of a sign,and with an absolute change of the value of one third of the accuracy, asubstantial amount of work has been done in the last two years to improve theknowledge of all the contributions to this stringent limit to CKM unitarity,and more is expected in the next years. In this paper we present an organizedsummary of all the important contributions presented during the WG1 sessions,referring as much as possible to the contribution papers prepared by theindividual authors.

Precise determination of V_ud and V_us