Welcome to the collaboratory of the Group ‘Constructing a global database on Migrant Organizations’. Starting from a Political Opportunities Structures (POS) approach the ambition of this group is to create a comparative framework to analyse immigrant organizing processes. The databases contain information on nationality, ethnic origin and religion. The categorization of organizations was done both through group-specific markers as well as through objectives. Group specific markers are ‘youth’, ‘elderly’, ‘women’, while for objectives one might think of ‘welfare’, ‘heritage’, ‘sport’ and so on. To conclude, the databases register the scale of operations of the organization: local, regional or national.