  If Nature is supersymmetric at the weak interaction scale, what can we hope
to learn from experiments on supersymmetric particles? The most mysterious
aspect of phenomenological supersymmetry is the mechanism of spontaneous
supersymmetry breaking. This mechanism ties the observable pattern of
supersymmetric particle masses to aspects of the underlying unified theory at
very small distance scales. In this article, I will discuss a systematic
experimental program to determine the mechanism of supersymmetry breaking. Both
$pp$ and $e^+e^-$ colliders of the next generation play an essential role.
[Lecture presented at the 1995 Yukawa International Symposium (YKIS`95), to
appear in the proceedings.]
