  We describe a method that is used to reduce, significantly, the number of CP
violating complex phases in the Yukawa parameters. With this Reduction of
Complex Phases (RCP) we obtain only one CP violating complex phase in the case
where the neutrinos have an (effective) $3\times 3$ Majorana mass matrix. For
the See Saw extension of the SM with three righthanded neutrinos, and in
connection with CP violation in leptogenis, we reduce the usual 6 complex
phases to only 2.
