the development of residential architecture in yugoslavia during the period of socialism had its peak in the 1960s and 1970s. significant progress in construction was accompanied by housing research directed towards finding the optimal urbanistic solutions for the newly formed lifestyle of the socialist society. the tendency was to "pack" as many residential units as possible into each building, almost up to the limits of the functional minimum, at the same time with the aim of setting a more humane pattern of living. as a consequence of these aspirations, the following concepts emerged, making the core of housing research: (a) apartments with an extended circulation area, (b) apartments with a central sanitary core, (c) apartments with a circular connection and (d) apartments with extended perspectives ("an enfilade”).