Thorsten Pieper explores the impact of innovation barriers along the user innovation process, in particular whether technological, social, legal and ownership barriers change the properties of user-developed products. This study roots from the â¤?open innovation⤠research field and reveals insights from innovating users in â¤?collaborative workspacesâ¤. The results prove a hierarchical allocation of innovation barriers regarding their influence on the end-product and moderating influences of user innovators⤠personal characteristics. The author discusses these insights and provides practical recommendations for more efficient promotion of user innovations and successful integration in corporate "co-creation" projects.