With the support of the Jisc-led Strategic Content Alliance (SCA), Ithaka S+R has developed this guide to support those who are actively managing digital projects and are seeking to develop funding models that will permit them to continue investing in their projects, for the benefit of their users, over time. This report updates Sustainability and Revenue Models for Online Academic Resources (2008) in two major ways: first, by expanding the list of revenue models covered in order to take into account emerging models, including highlighting those methods that are compatible with open access. Second, the report places the notion of ‘revenue generation’ in the context of the fuller range of funding activities we have observed in higher education and the cultural sector. In addition to practices more often seen in the commercial world like advertising and corporate sponsorships, the report devotes time to discussions of a range of philanthropic sources of support as well as support offered by host institutions.