In general, galaxies have experienced different environments during their 
lifetimes: e.g. first residing in a region of the Universe with "average" 
density, then spending some time in a "group-size" environment before being 
accreted onto a massive cluster. In this context, it is relevant to understand 
the specific role of different environments (e.g. "group? or "cluster" scale) 
in galaxy evolution, and to disentangle this from that of "internal" physical 
processes. 
In this talk, I will present the results of numerical simulations aimed 
to study the influence of the environment in the evolution of galaxies. 
Specifically, I will describe how disc galaxies evolve within a "group-size" 
environment, probing different orbital, structural and kinematical properties 
of galaxies.