  At the end of the five years of work in our GeoDiverCity program, we brought
together a diversity of authors from different disciplines. Each person was
invited to present an important question about the theories and models of
urbanization. They are representative of a variety of currents in urban
research. Rather than repeat here the contents of all chapters, we propose two
ways to synthesize the scientific contributions of this book. In a first part
we replace them in relation to a few principles that were experimented in our
program, and in a second part we situate them with respect to a broader view of
international literature on these topics.
