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The current paper analyses how human factors aspects and system design aspects may co-operate in the design of a particular application, i.e. electronic mail systems. A review of research on the experience of electronic mail systems is presented, as well as a pilot study covering the experience of mail systems in different user groups. The users were found to differ mainly in terms of the tasks they performed and wanted to perform. It is therefore suggested that a task analysis is essential in system design. Current practice on task analysis is presented, which shows that a more detailed task analysis is needed to be useful. In order to achieve flexibility, the subtasks found should be designed in a modular way. Here the system designer will need different supports. To facilitate co-operation between end-users and system designers some kind of communication support is also suggested.