For the successfull design of mechatronic systems, the collaboration of experts of the participating domains is neccecary. In addition the interdependencies between the product and the associated production system must already be considered at an early stage of the development process. A suitable starting point is the integrative conceptual design. The linkage between these phases is the conceptual design of the assembly system, including the assembly-oriented structuring of the product as well as the creation of a first assembly sequence. The assembly concept is the basis for the design of manufacturing processes. In established approaches this transition is not considered adequately.In the present work a design framework for the conceptual design of the assembly based on the principle solution of mechatronic systems is presented. The design framework consists of three components: a detailed procedure model, which describes the activities, a technique for the description of the conceptual design of the product and the production system as well as a collection of methods required to solve specific tasks within the conceptual design. The approach supports the development of a first assembly concept and closes the gap between the conceptual design of the product and the conceptual design of the according production system. The use of the design framework is illustrated and explained by means of a consistent application example.