  Once superpartners are discovered at colliders, the next challenge will be to
determine the parameters of the supersymmetric Lagrangian. We illustrate how
the relative phases of the gluino, SU(2), and U(1) gauginos and the Higgsino
mass parameter mu can be measured at a hadron collider without ad hoc
assumptions about the underlying physics, focusing on Fermilab. We also discuss
how the gluino and LSP masses can be measured.
