This study examines interactions between the African Union (AU) and the Organisation of African, Caribbean and Pacific States (OACPS), within the theory of regime complexity. Multiple scholars have...Show moreThis study examines interactions between the African Union (AU) and the Organisation of African, Caribbean and Pacific States (OACPS), within the theory of regime complexity. Multiple scholars have shown the relevance of using regime complexity to understand that dynamics of international organisations (Orsini et al., 2013; Margulis, 2021). This study contributes to the understanding of regime complexity by investigating modes of interaction of the AU and the OACPS in a situation of overlapping interest or membership in their relations with the European Union. The modes of their interactions were tested by analysing publicly available documentation. The analysis revealed that the behaviour of an institution in a regime complex can differ depending on the area of interest. The case also showed that overlapping institutions can have significantly different approaches towards each other. Where the AU positions itself as a competitor and rival of the OACPS, the latter positions itself as a collaborator of the former.Show less