Abstract
Subscription-based electronic resources have come to represent an ever-increasing proportion of library collections budgets. If we are going to secure the most value from our expenditures on such resources, ongoing assessment should be approached more systematically, with the full engagement of subject selectors.
The implementation of ongoing assessment at any library will involve at least three factors: an understanding of the larger environments in the context of which assessment is taking place; a methodical approach to involving selectors more fully in assessment activities; and, finally, an evaluation of the tools that are available to support selectors in their assessment work.