Introduction The central goal of transaction log analysis is to acquire new knowledge, which will help library managers, systems designers/developers, and researchers better understand how online information systems are used by library patrons and staffs. This knowledge can then be used to improve library services and operations through better designed systems and better allocation (or reallocation) of library resources. An example of reallocation of resources is changing schedules of public service staff to more closely match when and where patrons need help (e.g., in nonfiction, on weekends) and the relocation of terminals to where they are needed the most (e.g., to the science reference area). The system's resources (access points, online storage, databases) can also be distributed for the most effective and efficient operations through the use of transaction log data. A clearer understanding of human/computer interaction within the library setting can also be used to improve the design and utilization of other online systems and services used within libraries and other organizations.