  We present an analysis of the properties of the lensing cluster MS0440+0204
at z=0.1965. MS0440+0204 has been observed with a variety of telescopes at
diverse wavelengths: from the ground with CFHT, MMT and KECK and from Earth
orbit with HST, ROSAT and ASCA. Mass determinations are separately obtained
from galaxy virial motions and X-ray profile fitting. A simple beta-model fit
to the X-ray data yields a mass of (1.3+/-0.2) x10^{14} M_sun within 583 kpc of
the cluster center, but more general models fit all of our data better and
allow a wider range of masses that are consistent with the lensing data. In
addition, the X-ray data yield a mass distribution profile that is well
described by a beta model with a core radius of 26.7 kpc. The velocity
dispersion of galaxies yields a mass of 4.8^{+1.5}_{-0.94} x 10^{14} M_sun
within 900 kpc. In the inner 24.5arcsec there are 24 arcs that appear to be
strong gravitationally lensed images of background sources. Models of the
cluster mass distribution and its lensing properties reveal 5 background
sources at various redshifts each forming 2 or more arcs. At 100 kpc, the lower
limit mass from lensing is about a factor of 2 greater than the X-ray
determined mass. lens model than the X-ray determination. To reconcile the mass
estimates from the X-rays and the lensing and to try to understand the steep
slope of the gravitational lens mass, we tentatively explore a model with a
supercluster surrounding the cluster and with a mass profile that increases
more rapidly than a beta model at large radii.
