"First, we will introduce the international Catholic communication associations OCIC and UNDA through a short history of both organisations, exploring the activities they deployed, the most important developments during their 73-year existence, and look into their relations with the Church, organised laity and the broader field of local, national, international, and intergovernmental (media) organisations. In the second part of this report, we will introduce the OCIC-UNDA archives through a short history of the archives’ management and a detailed institutional history of the organisations that shaped them. Taking this into account, we will then analyse their structure, content and lacunas and evaluate their state of preservation. We will also provide an overview of the reference library’s contents with special attention to publications of OCIC, UNDA and their predecessors." (Introduction)