  We apply simple optical and SZ cluster finders to mock galaxy catalogues and
SZ flux maps created from dark matter halos in a (1 Gpc/h)^3 dark matter
simulation, at redshifts 0.5 and 0.9. At each redshift, the two catalogues are
then combined to assess how well they can improve each other, and compared to
several variants of catalogues made using SZ flux and galaxy information
simultaneously. We use several different criteria to compare the catalogues,
and illustrate some of the tradeoffs which arise in tuning the galaxy cluster
finders with respect to these criteria. We detail many of the resulting
improvements and issues which arise in comparing and combining these two types
of data sets.
