Leading migration researchers provided their perspectives on suitable methodologies at an international expert meeting that took place at the OECD in Paris on 23-24 February 2015.a Data constraints sometimes made it impossible to analyse all aspects in every partner country. Each country report and the integrated report provide detailed descriptions of their methodologies. What is the added value of the project? ( The contribution of the foreign-bom employed to GDP in 2010 (1.5%) was just below the commensurate share in employment (1.6%).