The European Commission designs and promotes policy networks in almost all policy fields. Knowledge about networks is necessary for a better understanding of the overall policymaking process in multilevel governance systems like the European Union (EU). Studying EU networks helps to explain how policies emerge, how they are framed and processed, why they take the character they do, and how they might contribute to understanding the course of European integration. The political system of the EU is characterized by the coexistence and interdependence of formal and informal networks that are part of its multilevel governance. While the interplay of formal and informal actor's networks has been researched to some extent (Klüver, 2014; Mahoney, 2008), informal policy networks have been paid less attention in EU integration theory (Christiansen and Piattoni, 2004)-one reason being that rules for processes, membership, and responsibilities are often not clearly defined and are not readily detectable from the outside. Informal policy networks may include expert groups, civil society organizations (CSOs) such as lobby groups, social partners, or companies that argue about policy content also discussed in the formal policy-making process. Researchers used social network analysis (SNA) as an essential technique to investigate such complex networks among actors, be they individuals, small groups, or international organizations (Carrington et al., 2005; Jansen, 2006; Wasserman and Faust, 1994). SNA allows investigating a broad range of professional and personal networks and their quantitative aspects such as group size, the number, and status of contacts. A common challenge in network analysis is the lack of information on other elements of social life like inter-agency and process-related aspects (Crossley, 2010). Qualitative network analysis (QNA) aims addressing the shortcomings of SNA by applying a micro-perspective instead of a macroperspective and qualitative instead of quantitative methods, and taking an insider instead of an outsider view. A qualitative approach to networks prompts a focus on personal and social networks, for instance, friendships, family relations, or migration ties. Until now, only a few attempts have been made to apply QNA to policy networks (Baumgarten and