1. A computer-implemented method ( 400 ) for creating graphical assignments between objects, the method ( 400 ) comprising the following steps: displaying ( 410 ) a predefined object hierarchy ( 110 ) and an object type selector ( 130 ), wherein the object type selector ( 130 ) provides a plurality of predefined object types ( 131 - 134 ); providing (420) a rule database ( 190 ), the rule database storing for each object type ( 131 - 134 ) at least one predefined object type assignment ( 191 - 194 ) of a corresponding predefined subset ( 130 - 1 , 130 - 2 , 130 - 3 , 130 - 4 ) of object types to the object type ( 131 - 134 ); and inserting ( 430 ) a first object ( 111 ) into the object hierarchy ( 110 ) in accordance with one of the object type assignments ( 191 , 192 ), wherein the first object ( 111 ) has a first object type ( 131 ) and is assigned to a second object ( 112 ) having a second object type ( 132 ).