BRUSSELS - BELGIUM - 01 JULY 2009 -- From left Dr. Piet H. RENOOY, Regionplan Beleidsonderzoek (NL), Pr. Colin C. WILLIAMS, University of Sheffield (UK), Radoslaw OWCZARZAK, Eurofound research manager at a photo session during the presentation of their new Eurofound report 'Measures to tackle undeclared work in the European Union'. Sitting . Photo: Erik Luntang/INSPIRIT Photo