This chapter is one output of research led by a Belgian consortium directed by M. Beuthe (UCLouvain – Mons), H. Meersman and E. Van de Voorde (U. Antwerp), M. Mouchart (UCLouvain), and F. Witlox (U. Ghent). We thank the Belgian Federal Office for Scientific, Technical and Cultural Affairs (OSTC) for the financial support it granted to this project. This is an updated version of an earlier chapter (Beuthe, Bouffioux, Krier, & Mouchart, 2008).

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