In our study we provide a case study of implementing sustainability aspects into the product development process of a Small and Medium Enterprise (SME). The objective of the study is to, together with the company, co-create a product development process that represents a step towards sustainability. For this a tool called the Method for Sustainable Product Development (MSPD) is used. The methodology of the study includes mapping the current product development process in the organization, adapting the MSPD based on criteria set by the organization, implementing the MSPD into the product development process of the organization in a co-creative way and finally applying the new product development process to a test case within the organization. Various participatory action techniques including workshops and interviews are used to ensure co-creation of the results. It was found that raising questions on sustainability aspects in product development can be seen as a first step of an organizational move towards sustainability. With this the MSPD worked as intended. The practical application showed that further steps were necessary. Particularly additional education in sustainability and theinvolvement of entities in the organization external to the product development process were found as crucial next steps.