"Tens of millions of dollars, pounds, and euros are invested each year by government agencies and private foundations to develop and support digital resources in the not-for-profit sector. As budgets tighten, will these digital resources be able to survive and thrive?
This question is at the heart of the Ithaka Case Studies in Sustainability project, a multi-year, international exploration of the strategies being used to support digital initiatives over the long term. Twelve detailed case studies present the steps project leaders have taken to achieve this, with special attention paid to their strategies for cost management and revenue generation. These studies include financial data, and explore the decision-making process that project leaders undertake when experimenting with different strategies to find the best fit for their organization....."
Link

Final Report
Sustaining Digital Resources: An On-the-Ground View of Projects Today (PDF)
Nancy L. Maron, K. Kirby Smith, Matthew Loy
Foreword by Kevin Guthrie and Laura Brown

Case Studies
DigiZeitschriften: Library Partnership and a Subscription Model for a Journal Database (PDF)
Göttingen State and University Library, University of Göttingen