  In this work we show how well can the cosmological parameters be constrained
using galaxy cluster data. We also show how in the process of fitting the model
which attempts to describe the data it is possible to get some information
about the cluster scaling relations T-M and L_x-T. Among other conclusions we
found that only low density universes (Omega approx. 0.3 with or without
cosmological constant) are compatible with recent data sets. These constraints
will be improved with future SZ data.
