  We study the evolution of two fundamental properties of galaxy clusters: the
luminosity function (LF) and the scaling relations between the total galaxy
number N (or luminosity) and cluster mass M. Using a sample of 27 clusters
(0<z<0.9) with new near-IR observations and mass estimates derived from X-ray
temperatures, in conjunction with data from the literature, we construct the
largest sample for such studies to date. The evolution of the characteristic
luminosity of the LF can be described by a passively evolving population formed
in a single burst at z=1.5-2. Under the assumption that the mass-temperature
relation evolves self-similarly, and after the passive evolution is accounted
for, the N-M scaling shows no signs of evolution out to z=0.9. Our data provide
direct constraints on halo occupation distribution models, and suggest that the
way galaxies populate cluster-scale dark matter halos has not changed in the
past 7 Gyr, in line with previous investigations.
