Is your library getting every pound's-worth out of that thousand-pound database? Should you re-subscribe to that pricey e-journal? Are your indexes serving your users? Collection development and acquisitions librarians are facing tough new questions. Unfortunately these were, for many, unanswerable questions - until now. value in the digital age. Learn how to use effectively the electronic data captured from various network activities to manage library collections, budgets, and services. Using e-metrics, the authors identify expensive and underused digital resources, visualize virtual user behaviour patterns, and construct new collection development strategies. e-metric system and apply it with supplier usage statistics to critical collection management and financial decisions. Practical tips and detailed analysis illustrate the important application of e-metrics to help you better serve your users and run an effective library.