Delivering industrial Product-Service Systems (IPSS) is a trend for companies in the german mechanical and plant engineering industry. IPSS are holistic problem solutions including an integrative combination of a physical core product and related services. Furthermore, IPSS are offered in customised business models. Due to the fourth industrial revolution, IPSS are transformed towards smart IPSS. Here, digital business models are necessary to take advantage of all opportunities belonging to smart IPSS. Therefore, a systematic analysis of digital business models for smart IPSS is presented.