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We suggest the use of technical modeling systems to introduce more semantics directly into the internal object representation. Firstly, we will introduce the technical modeling approach and the technical model as the basic concepts for an integrated engineering system. Then, we investigate the notion of “technical dependencies”, that can be characterized by the term technical constraints. They restrict the design process in such a way that they guarantee the design of a consistent part fulfilling all desired functional specifications. To show the variety of these constraints, we give an example taken from the area of shaft design. Special emphasis will be given to the modeling of the technical object structure and the organization of the constraints by means to be provided by Knowledge Base Management Systems. Further, we will point out the extensibility of our approach in order to add new technical elements or operations.