This guide suggests methods for measuring human performance for the purpose of scientific research and system test and evaluation. The information contained in this document is provided as guidance, not mandated as direction. This guide should be considered during the planning, conduct, and analysis of human performance measurement activities. The objectives of this guide are: (1) to foster human performance measurement (HPM) techniques that have proved to be effective; (2) to promote commonality across research projects and, thus, enable comparison of results across evaluations; and (3) to enable the development and use of common HPM tools for data collection and data processing.