The chapter deals with the intergenerational and ideological frictions among the architects and architectural groups within CIAM (Congrès internationaux d'architecture modern). Predominantly based on the recent publications “The Atlas of the Functional City” and “Cornelius van Eesteren: The Idea of the Functional City”, but also archival sources from FLC (Fondation Le Corbusier, Paris), HNI (Het Nieuwe Instituut, Rotterdam) and gta (Institute for the History and Theory of Architecture at ETH, Zürich), the chapter focuses on the period between CIAM fourth (1933) and fifth congress (1937), including a number of related, preparatory meetings. Opposed discourses and positions are traced and analysed within the specific social cliques and networks rendered through a variety of personal and group interactions during the CIAM events. Relying on the knowledge from the field of digital humanities and using the IT tools for visualisation of artists’ and architects’ networks of 20th century developed within the ART NET project, the chapter provides a series of data visualisations that enable detailed analysis of the interactions among the groups and individuals within CIAM in the given period. Aiming to demonstrate the scope of the network, regardless of the position of each individual within the dominant historiographical narratives, the chapter tends to propose a “horizontal view” of CIAM network, shedding light on the discursive ruptures as defining characteristic of its historical evolution.