(vi) Finally, the concept of universality classes has not been properly explored yet in the context of random network models. For this we have to dene scaling exponents that can be measured for all random networks, whether they are generated by a model or a natural process. The clustering of these exponents for dierent systems might indicate that there are a few generic universality classes characterizing complex networks. Such studies have the potential to lead to a better understanding of the nature and growth of random networks in general.