We consider a time-dependent Schrodinger equation for the Friedmann-Roberts
on-Walker (FRW) model. We show that for this purpose it is possible to incl
ude an additional action invariant under reparametrization of time. The las
t one does not change the equations of motion for the minisuperspace model,
but changes only the constraint. The same procedure is applied to the supe
rsymmetric case. (C) 2001 Published by Elsevier Science BN.