Katia RADJA was awarded her PhD in economic sciences in 2003 from the University of Versailles Saint-Quentin-en-Yvelines, under the direction of François-Régis Mahieu. Katia Radja is a lecturer in economic sciences at the UVSQ and is joint manager of the professional degree in management of Environmental Services since 2004. Her research activities are drawn from the fields of development and sustainable development and are organized around several themes: conditions and quality of life, economics and the family, learning-skills-employment and sustainable development.