Galaxy groups are considered to be an intermediate stage between the most massive dynamically relaxed objects in the Universe and field galaxies. In such environments several physical processes occur that can modify galaxy properties. The efficiency of these processes at low redshift (z ≤ 0.1) results in a clearly defined mass and luminosity segregation, while at high redshift (z ≥ 0.6) the efficiency of these processes remains an open question. In this talk I will present our recent results obtained using a sample of DEEP2 galaxy groups in a wide redshift range (0.2 ≤ z ≤ 1) and preliminary results obtained from low-z compact groups identified in the neighbourhood of loose groups.