This document discusses a tool called Service CAD that is designed to help with systematic product-service system (PSS) design. Service CAD aims to support PSS modeling, evaluation, and help designers reason through the design process. It does this by classifying and collecting information about individual products, services, and how they relate within a system. This information can then be integrated to design new PSS offerings, with Service CAD storing explanations for how the design increases quality. Overall, the document outlines the challenges of PSS design and introduces Service CAD as a potential solution to help designers address those challenges in a systematic way.