Household-based survey designs are notoriously ineffective in studying hard-to-reach populations. The presentation focused on lessons learned from more than 15 years of field surveys on migrants and similarly hard to reach populations carried out using alternative field methods. Three different methods to overcome the lack of sampling frames were presented. The first case study presented was the experience of the Regional Observatory on Integration and Multiethnicity of Lombardy that, since 2001, has been carrying out cross-sectional regional representative surveys using the Centre Sampling method, also reaching undocumented migrants. The second experience regarded two surveys aimed at the investigation of genital mutilation/cutting prevalence among migrants through a combination of facility-based and snowball sampling, a methodology discussed and tested during the Daphne project FGM-Prev founded by the European Commission. Finally, the presentation discussed an adaptation of the Capture-Recapture Sampling to estimate the number of street-based sex-workers in Milan using data collected by NGOs assisting sex workers through mobile units.
The seminar is a part of the series of international seminars that are organised by the European Centre.