Abstract
Business application systems with online operations obviously need good man-computer interfaces. Experimental studies seem to be a useful approach to face the problem of designing user-adequate interfaces. With special regard to the design of dialogues for online accounting, a subset of an application system was redesigned to give several different features of dialogue design, while all other parameters like hardware and application-bound functions remained identical. The differences in the constructed dialogues can be divided into three categories, which are (A) the presentation of information by the system, (B) the handling of input and user errors and (C) the means of dialogue operations including control functions and online documentation. 48 professional accountants carried out a series of tasks, involving the handling of accounts receivable entries, with each of the three systems. All interactions were recorded. Results are given for the improvements achieved by the modifications in dialogue design. The first part concerns the behaviour of the subjects with respect to their different online experiences. In the second part the general effects of the special design features are shown. Finally the user's own judgements based on the evaluation of a post-test questionnaire are discussed.
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