The evaluation of user interfaces for Semantic Web-based applications is hard: Often, such applications are designed on top of the very generic triple model and can make only limited assumptions on the structure of the data it operates on. Many concepts, like ontologies and resources, are unfamiliar to users, and the resources for such evaluations are limited. However to achieve a certain level of interface quality, user assessments are a necessary step in UI design. In this paper we describe the experiences we have made with a small-scale of such an application, which revealed issues that can be applied to a wide class of applications.

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