Supersymmetry breakdown in M-theory

We investigate gaugino condensation in the framework of the strongly couple d heterotic E-8 X E-8 string (M-theory). Supersymmetry is broken in a hidde n sector and gravitational interactions induce soft breaking parameters in the observable sector. An important difference to the situation in the weak ly coupled case is the fact that observable sector gaugino masses are compa rable in size to the soft scalar masses. They are all of order of the gravi tino mass and lead to satisfactory phenomenological and cosmological conseq uences.