Abstract: An evaluation system for computer performance resulting from user generated information at a remote workstation. The system 6 includes interfaces 8, 9 between the computer 5 and the workstation 14 and means 10 for recording user generated information and computer responses and times associated therewith. A processor 11 identifies known commands and responses to produce a user profile taking into account the user thinking time and typing rate or intercharacter times. The playback block 12 allows repeated reproduction of the original user's actions with the original delays including thinking times and intercharacter times associated therewith. During playback, the response times of the computer for commands and character echo times are measured and stored for analysis by block 13. Such analysis allow statistics for different system configurations or load conditions to be provided.