Cerna’s index measures openness and restrictiveness of migration policies targeting high-skilled migrants. The index covers 2007 and 2012 and provides information on 20 countries. Countries are selected on the basis of different migration histories and experiences and levels of (economic) interest groups’ involvement in policy-making. The index is disaggregated into admissions mechanism and work permit rights (made up of six indicators: numerical caps, labour market test, labour protection, employer portability, spouse’s work rights and permanent residency rights). Scores are assigned to each of the six categories from 3 (=highly restrictive), 2 (=moderately restrictive), 1 (=minimally restrictive) to 0 (=highly open). All policies are ranked on the same criteria. The individual points for the six categories are then added and converted into an index, where the most restrictive country receives a value of 100.