Spatio-temporal territories are constantly changing complex systems composed of heterogeneous content: material and immaterial elements, as these interactions are being generated, combined and experienced by diverse subjects in a specific context. Open Interactive Mapping is the visualisation of an under-construction methodology of mapping-and-designing the city, through this point of view. The methodology approaches the city as constituted by signifying objects-subjects’ interactions, which can reveal its component relations among heterogeneous para- meters. In dialogue with questions on how city’s multiplicity can be mapped and how such a mapping might contribute to designing-intervening processes, intention of the methodology is to function as a tool capable of revealing and at the same time abstracting city’s complexity, contributing to decision-making and management processes in a territory. The methodology is composed of three levels of actions (Fig.1 in blue colour): the gathering of data (diverse mappings); the search of translation parameters among the mappings; applications and experiments that test the methodology in specific case-studies. The organisation and the capacities of data management are being performed through the Open Interactive Map (OIM) that is being presented in this poster. The general aim of the OIM is to be capable of organising and managing city’s complexity as this emerges from multiple mappings and their relations. The OIM is a system of a data base of multiple mappings in their original form, a table and a map (fig.1 in green colour). The horizontal axis of the table integrates references to all the different mappings and the vertical the properties/ (translation) parameters list as organised in categories. On the map the different references to physical locations are noted. The data-base, the table and the map are interconnected through many options of selections. For instance, selections on the table can activate networks of locations on the map, enabling multiple decompositions and recompositions of the city beyond the physical ones. Selections on the map can indicate properties attributed to locations. Combinations – sequences of selections in a logic of back-and-forth actions, based on specific scenarios and intentions can guide and support a decision-making process while feeding the perspective of design logics that take nothing fore-granted.