Nonlinear system identification is an extremely broad topic, since every system that is not linear is nonlinear. That makes it impossible to give a full overview of all aspects of the fi eld. For this reason, the selection of topics and the organization of the discussion are strongly colored by the personal journey of the authors in this nonlinear universe.
Funding agencies:This work was supported in part by the Flanders Fund for Scientific Research (FWO), the Vrije Universiteit Brussel (VUB), Brussels, Belgium, and the European Research Council Advanced Grant SNLSID, under contract 320378.