Legal regulations designed to protect individual liberties and personal data has significant implications for survey design when it restricts access to such populations and to information regarding ethnic background, religion, or race. This is a particularly significant concern for researchers using quantitative surveys. Working Group 3 (WG3) was asked to reflect on these challenges before analyzing the results of the survey mapping conducted by WG1 and WG2. This report describes the background for collecting data concerning EMMs in Europe by: 1. Emphasizing the relevant EU legal frameworks pertaining to data collection in the EU and some of their implications for conducting surveys of immigrants and ethnic minorities. 2. Reviewing and evaluating the empirical knowledge underlying these frameworks and specific data collection, analysis, and reporting practices. 3. Providing an overview of the methodological challenges faced by researchers who survey EMMs. 4. Alerting EMM survey data producers and data users to the range of integration indicators that could inform their future data production and data analysis efforts.