A new business model, conceived by WZL of the University of Aachen, bases on Open Source development and advances Outsourcing. Commercial Open Source Development (COSD) has the capability to break open the area of conflict between customer orientation, individualisation, product design costs and error probability by embedding the customer systematically and lucratively into product development. Two trends of product design support COSD: Functions of technical products can be increasingly affected through Software solutions; Open Source principals have reached a high level of maturity.