JISC has released PIRUS—Publisher and Institutional Repository Usage Statistics: Final Report.
Here's an excerpt:
The four main outputs of the project are:
a. A proof-of-concept COUNTER-compliant XML prototype for an individual article usage report, Article Report 1: Number of successful full-text article downloads, that can be used by both repositories and publishers. In principle this report could be provided for individual authors and for institutions. In practice, the individual author reports are much easier to generate and are a realistic short-term objective, while the reports for institutions and other entities, such as funding agencies, will be more complex and should be regarded as a longer term objective.
b. A tracker code, to be implemented by repositories, that sends a message either to an external party that is responsible for creating and consolidating the usage statistics and for forwarding them to the relevant publisher for consolidation or to the local repository server.
c. A range of Scenarios for the creation, recording and consolidation of individual article usage statistics that will cover the majority of current repository installations. Each repository may select the scenario that corresponds to their technology and implementation.
d. Specifying criteria for a central facility that will create the usage statistics where required (for some categories of repository) and collect and consolidate the usage statistics for others.
