Museum Amstelkring is an historic building with a hidden church and mixed collections. It attracts many visitors and the church is still in use. The museum is concerned that it can no longer adequately balance preservation and presentation requirements. Instituut Collectie Nederland (ICN) was asked to give integral advice on preventive conservation, visitor impact and collection management, and to investigate whether building an extension to the museum might ease the pressure on the main building and create better opportunities for the collection. A complete risk assessment and other investigations were done to attach objective measures to perceived issues and quantify risks so that their relative importance could be determined. This approach enables museum management to prioritize and make reasoned decisions about improvements and investments. For museum staff it draws attention to weaknesses in working procedures while for conservation scientists it reveals issues that need further research. -- ICN