Research shows that people have great diffi culty in understanding dynamics. Even when problem descriptions contain all the necessary information, people tend to mismanage dynamic systems. Given the increasing complexity of our modern societies, effective ways to communicate dynamics need to be identifi ed. In this paper we explore the effectiveness of simulator-supported problem descriptions. We add an interactive simulation tool to the textual instructions of a well-tested natural-resource management task. With this tool, the dynamic aspects of the problem can be explored. In laboratory experiments, we fi nd that simulatorsupported problem presentations improve both the subjects' performance and their understanding. The analysis of mental effort data reveals that the simulator facilitates effective cognitive processing and thus allows the subjects to acquire more adequate mental representations of the task. Building on these results, we derive implications for the design of interactive learning environments and for the more general presentation of complex dynamic problems.

The 2002 eEurope Action Plan advocated adoption of the WAI Content Guidelines in public EU web sites. Many of the European countries have performed web accessibility evaluations. Most of the evaluations are based on the Web Content Accessibility Guidelines from W3C/WAI. Still, a range of different evaluation methodologies and scoring schemes are deployed across the member states. This makes it hard to compare the web accessibility status between the different EU countries. The European Accessibility Internet Observatory aims to addresses this problem. The Observatory will produce automated, large scale web accessibility measurements based on which a range of monthly benchmarks will be produced and published online. In this way, the benchmarks should provide a useful input to the eAccessibility and eInclusion policy making.

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Abstract. In this paper we propose the Public Barrier Tracker (PBT) -a comprehensive solution that supports both filing and handling of user feedback on web accessibility. We give an overview of some existing approaches for gathering user feedback on accessibility barriers and outline the PBT functionality. The PBT can also offer further support for the implementation of the WAD: The collected data could be useful for monitoring and reporting as well as the enforcement mechanism.

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