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Formal description of real-time requirements is a difficult and error prone task. Conceptual and tool support for this activity plays a central role in the agenda of technologytransference from the formal verification engineeringcommunity to the Real Time Systems development practice.In this article we present V TS, a visual language to define complex event-based requirements such as freshness, bounded response, event correlation, etc. The underlyingformalism is based on partial orders and supports real-timeconstraints. The problem of checking whether a timed automatonmodel of a system satisfies these sort of scenariosis shown to be decidable. Moreover, we have also developeda tool that translates visually specified scenarios into observertimed automata. The resulting automata can be composedwith a model under analysis in order to check satisfactionof the stated scenarios. We show the benefits of applyingthese ideas to some case studies.