  We introduce and present preliminary results from COCOA (Cluster simulatiOn
Comparison with ObservAtions) code for a star cluster after 12 Gyrs of
evolution simulated using the MOCCA code. The COCOA code is being developed to
quickly compare results of numerical simulations of star clusters with
observational data. We use COCOA to obtain parameters of the projected cluster
model. For comparison, a FITS file of the projected cluster was provided to
observers so that they could use their observational methods and techniques to
obtain cluster parameters. The results show that the similarity of cluster
parameters obtained through numerical simulations and observations depends
significantly on the quality of observational data and photometric accuracy.
