Abstract: A computer-implemented method for generating and visualizing data structures, notably hierarchal data structures, comprising a plurality of nodes in a tree structure, at least some of which comprise intrinsic properties, wherein at least one of said primary and secondary nodes represents a data object of or a data interface towards a computer-implemented model of a physical structure. A visual representation of the plurality of nodes is created in a graphical user interface of the computer system. A user of the computer system is allowed to select data modules and to combine the selected data modules to build the data structures. Functional relations between data values of the nodes are provided to at least partially define the computer-implemented model on the basis of the intrinsic data of the nodes and on the basis of the mutual functional relations.