This Masters thesis examines the open spaces of an area known as the Schmelz, located in the north western part of Viennas 15th district. It is heading toward the compilation of planning principles, which are based on a detailed status analysis, to provide a higher quality in the open spaces and to extend the public accessibility for all inhabitants of the quarter. Research questions are examining qualities, deficiencies, accessibilities, and potentially publicly usable areas on a structurally-spatial level, as well as the meaning of the open space Schmelz for its users on a social level. The set of methods unites among other things historical research, open-space-planning-stocktaking and a standardised evaluation of users as well as elements of action research through my own work conducted by an open space initiative on site. The majority of the results show that the Schmelz is a very valuable open space for local recreation, especially for the local population. The Masters thesis is analysing the historical, and the current functional-, and open-space-qualities of the Schmelz, which is undergoing a restriction of experience-, and action-options through a gradual reduction of the public open space. Current access-limitations of the individual uses are producing a barrier-effect, and excluding varyingly certain user groups of a use. Due to the trend of “all-year living” in the allotment garden area despite a contrary zoning negative ecological and open-space-planning effects appear on the Schmelz. Furthermore, the open spaces of the roads and paths in the surroundings of the Schmelz exhibit open-space-planning potentials for the foot and bicycle traffic. Advice is being formulated for concrete structural measures as well as for a participative process for a sustainable development in the sense of a fair divided city.