The main part of existence of SAS is characterised by its being a part of Czechoslovak Academy of Sciences (CSAs). Archivists of the Central Archive of SAS has for several years together with its partner institution archive of Academy of Sciences of Czech Republic investigated partial problems of history of relationship between the SAS and CSAS. At the time a bilateral project under a name “Reflection of scientific links and relations in academy-like institutions” is being conducted, which further maps these complex relationships. The results of the investigation will be published in two-volume monograph History of Slovak Academy of Sciences (in cooperation with Institute of History of SAS).