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Awareness and feedback have been identified by many researchers as key concepts to achieve fluent collaboration when performing highly interactive collaborative tasks. However, it is remarkable that few studies address the effect that adding special kinds of feedback has on user awareness and task performance. This work follows a preliminary experiment in which we already studied awareness in Collaborative Virtual Environments, evaluating the effect of visual cues in collaborative task performance and showing that users tend to make more mistakes when such feedback is not provided, that is, they are less aware of the object at hand and the task mate. These early results were promising and encouraged us to continue investigating the benefit of increasing the awareness support for tasks that require close collaboration between users, but this time analyzing more types of awareness and experimenting with visual, audio and vibrotactile feedback cues.