Abstract: A method for fault diagnosis in a computer system comprises producing a log file of a user's interaction with a Graphical User Interface (GUI) of a user computer, omitting from the log file any text entered by the user during the interaction, and diagnosing the fault by reviewing the log file. The log file may be transmitted over a computer network for reviewing at a remote computer. The log file of GUI activity is small and does not occupy much storage space on a computer. The recordal of the user's interaction with the computer's Graphical User Interface (GUI) is a relatively straightforward process which utilises a minimal amount of the computer's processor and memory resources. The log which describes the user's interaction with the operating system's user interface and each application's user interface, captures the exact context of each interaction and enables a rapid fault diagnosis to be made by a technician.