Title: An architecture for the aggregation and analysis of scholarly usage data. Abstract: Although recording of usage data is common in scholarly information services, its exploitation for the creation of value-added services remains limited due to concerns regarding, among others, user privacy, data validity, and the lack of accepted standards for the representation, sharing and aggregation of usage data. The creation of services that build on collections of usage logs aggregated across information services and communities is even more rare, as their emergence is additionally hindered by the lack of accepted technical and legal frameworks to share and aggregate usage logs. This paper presents a technical, standards-based architecture for sharing usage information, which we have designed and implemented. In this architecture, OpenURL-compliant linking servers aggregate usage information of a specific user community as it navigates the distributed information environment that it has access to. This usage information is made OAI-PMH harvestable so that usage information exposed by many linking servers can be aggregated to facilitate the creation of value-added services with a reach beyond that of a single community or a single information service. This paper also discusses issues that were encountered when implementing the proposed approach, and it presents preliminary results obtained from analyzing a large-scale usage data set obtained from a federation of linking servers. Bio: Johan Bollen is Assistant Professor at the Computer Science department of Old Dominion University, which he joined in 2002. He was an assistant researcher at the University of Brussels from 1994-1999 and held a position at the Computer and Computational Science Division (CCS3) and Research Library of the Los Alamos National Laboratory from 1999 to 2001. He obtained his PhD in Experimental Psychology from the University of Brussels in 2001. His research focuses on studies of user behavior in digital information systems with applications to scientometrics and recommender systems for digital libraries. He is presently on leave of absence to work on a research project at the Los Alamos National Laboratory for the 2005-2006 academic year.