  In order to minimize the emittance at the Cornell Electron Storage Ring
(CESR), we measure and correct the orbit, dispersion, and transverse coupling
of the beam. However, this method is limited by finite measurement resolution
of the dispersion, and so a new procedure must be used to further reduce the
emittance due to dispersion. In order to achieve this, we use a method based
upon the theory of sloppy models. We use a model of the accelerator to create
the Hessian matrix which encodes the effects of various corrector magnets on
the vertical emittance. A singular value decomposition of this matrix yields
the magnet combinations which have the greatest effect on the emittance. We can
then adjust these magnet "knobs" sequentially in order to decrease the
dispersion and the emittance. We present here comparisons of the effectiveness
of this procedure in both experiment and simulation using a variety of CESR
lattices. We also discuss techniques to minimize changes to parameters we have
already corrected.
