Asset management aims at improving the overall performance of assetintensive industries by making and executing systematic and highest value decisions about the use and care of assets. To assist organizations to improve their asset management performance, maturity models can be used. In this paper we describe two applications of the Infrastructure Management Maturity Matrix (IM³). The IM³ consists of five maturity levels on the vertical axis (ad hoc, repeatable, standard, managed, optimal), and seven asset management dimensions on the horizontal axis (information management, internal coordination, external coordination, market approach, risk management, processes & roles, and culture & leadership). We present the results of two maturity checks performed at the Dutch National Highway Agency Rijkswaterstaat in 2011 and 2012. The results show significant progress and learning on all dimensions of the maturity matrix. In the discussion we reflect on the findings and possible future developments for RWS. We also discuss the potential impact of infrastructure maturity models for the professionalization of asset intensive organizations. ; Real Estate and Housing ; Architecture