A product-service system (PSS), also known as a function-oriented business model, is a business model, developed in academia, that is aimed at providing sustainability of both consumption and production.

Product Service Systems, put simply, are when a firm offers a mix of both products and services, in comparison to the traditional focus on products. As defined by (van Halen, te Riele, Goedkoop) "a marketable set of products and services capable of jointly fulfilling a user's needs". PSSes can be realized by smart products.

The initial move to PSS was largely motivated by the need on the part of traditionally oriented manufacturing firms to cope with changing market forces and the recognition that services in combination with products could provide higher profits than products alone. Faced with shrinking markets and increased commoditization of their products, these firms saw service provision as a new path towards profits and growth.