This article discusses how preservation, access, and sustainability are linked in cultural heritage organizations. It shows how these organizations are adapting to be more sustainable, focusing on people and the environment. The authors present a new model that ties together economic, environmental, social, societal, and operational aspects of sustainability. They demonstrate how this model can help institutions evaluate their practices and policies to ensure overall sustainability. By looking at scenarios common in cultural heritage settings, the model helps decision-making by showing how changes could affect different aspects of sustainability.