Extracting chargino/neutralino mass parameters from physical observables
  I report on two papers, hep-ph/9806279 and hep-ph/9807336, where complementary strategies are proposed for the determination of the chargino/neutralino sector parameters, $M_1, M_2, \mu $ and $\tan \beta$, from the knowledge of some physical observables. This determination and the occurrence of possible ambiguities are studied as far as possible analytically within the context of the unconstrained MSSM, assuming however no CP-violation. 
G. Moultaka