The techniques used to perform a measurement of the mixing
frequency of the B_s meson (Delta M_s) with the CDF detector at the TeVatron
collider are described. Particular stress is put on CDF techniques for
flavour tagging, which is possibly the major issue for mixing measurements
at a hadron collider. Also CDF performances on lifetime and final state
reconstruction are described. The final result of the amplitude scanning
presented at 2005 Winter Conferences is reported.