| Summary: | Human-computer interaction is central for computer assisted development. The aim was to investigate the user experience of a new (U2) compared to an old (U1) computer system, within a cognitive psychology frame of reference. Six subjects, frequently using the system, participated in the study. It was shown that the new (U2) compared to the old system (U1) enhanced and supported more the users’ system related procedures/tasks. Following issues were also indicated as important when an existing system functionality were replaced with a new one: (1) that the users see the benefits of the new functionality; (2) that the users recognize menus, toolboxes, terminology, colors etc. from the other parts of the computer system; (3) that the users understand how the new enhanced functionality supports them in their busi-ness procedures/tasks. The practical implication of the results obtained is that the new (U2) compared to the old system (U1) will enhance more the users’ daily tasks especially when multiple parcels or letter have to be managed.
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