  We have studied morphological evolution in clusters simulated in the
adiabatic limit and with radiative cooling. Cluster morphology in the redshift
range, $0 < z < 0.5$, is quantified by multiplicity and ellipticity. In terms
of ellipticity, our result indicates slow evolution in cluster shapes compared
to those observed in the X-ray and optical wavelengths. The result is
consistent with Floor, Melott & Motl (2003). In terms of multiplicity, however,
the result indicate relatively stronger evolution (compared to ellipticity but
still weaker than observation) in the structure of simulated clusters
suggesting that for comparative studies of simulation and observation,
sub-structure measures are more sensitive than the shape measures. We highlight
a few possibilities responsible for the discrepancy in the shape evolution of
simulated and real clusters.
