Funding information Dansk ErhvervOrganised interests play a double role in policymaking: as representatives of societal interests and as policy experts adding to regulatory quality. The former of these 2 roles has been examined over and over again, whereas the latter has almost completely evaded scholarly interest for a number of reasons. One reason is that it demands a focus on output rather than on traditional darlings such as representation, input legitimacy, or influence. Another is that it demands an interdisciplinary approach as regulatory quality-that which the involvement of organised interests seek to furnish-is a concept that includes elements from both law and political science. The question of how to design involvement of organised interests in order to support regulatory quality, however, is a question with both academic and practical relevance. Building on an empirical study, this paper attempts to spur theorising to address this relevant question. The result is 4 assumptions that describe the relationship between involvement of organised interests and regulatory quality.