Abstract: The proposed ActionMapper tool extends previous work on the generic KeystrokeMapper tool to provide an efficient method of logging and visualising a novice user's interaction with a dynamic interface. For any specified task the ActionMapper could generate a graphic representation of both the designer's conceptual model (represented by an Optimum path) and an indication of the user's mental model (represented by the actual path navigated by the user). In this study, the results from two usability experiments have been analysed using the KeystrokeMapper concept. From this a refined version of the tool, referred to as ActionMapper, is outlined. It is argued that the future implementation of the ActionMapper concept as a computer-based tool, which includes the automatic analysis and visualisation of numerous usability metrics, will substantially enhance the evaluation process. By adding event recording functionality in a prototype for a small handheld device, effective usability evaluations could also be conducted in a mobile context.