Integration of product design into service design, or vice versa, is considered to bring more efficient and effective value addition. Besides EcoDesign tools and methods, a methodology to design such an integration of products and services from a systemic perspective, or product-service systems (PSSs), is crucial. Design is considered as one of our complex intellectual activities to create new knowledge about artifacts. Computer software to support the complex activity is called computer aided design (CAD) tools. They are further enhanced by computer aided engineering (CAE) tools, which verify and optimize design solutions (mostly) with numeric simulation techniques. The objective of this study is the development of CAD/CAE tools used in PSS design process, which is an approach to improve the productivity of PSS design process and the quality of the designed PSSs.