Computer-implemented method, computer system and computer program product for creating graphical assignments between objects. An object hierarchy (110) and an object type selector (130) are displayed on an output device. The object type selector (130) proyides a plurality of predefined object types (131-134). A rule database stores for each object type at least one predefined object type assignment. A first object (111) is inserted (438) into the object hierarchy (110) in accordance with one of the object type assignments, wherein the first object (111) has a first object type (131) and is graphically assigned to a second object (112) haying a second object type (132). An object type can result from a combination of a predefined object type (134) with an object instance of any predefined object type. Graphical assignments between objects of at least two object hierarchies can also be created.