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In this paper we present validation tests that we have carried out on gestures that we have designed for an embodied conversational agent (ECAs), to assess their soundness with a view to applying said gestures in a forthcoming experiment to explore the possibilities ECAs can offer to overcome typical robustness problems in spoken language dialogue systems (SLDSs). The paper is divided into two parts: First we carry our a literature review to acquire a sense of the extent to which ECAs can help overcome user frustration during human-machine interaction. Then we associate tentative, yet specific, ECA gestural behaviour with each of the main dialogue stages, with special emphasis on problem situations. In the second part we describe the tests we have carried out to validate our ECA's gestural repertoire. The results obtained show that users generally understand and naturally accept the gestures, to a reasonable degree. This encourages us to proceed with the next stage of research: evaluating the gestural strategy in real dialogue situations with the aim of learning about how to favour a more efficient and pleasant dialogue flow for the users.