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This article describes how an interaction model based on multimodal signs like visual, auditory, tactile, proxemic, and others can improve the communication between humans and robots. We have examined and appropriately filtered all the robot sensory data needed to realize our interaction model. We have also paid a lot of attention to communication on the backchannel, making it both bidirectional and evident through auditory and visual signals. Our model, based on a task-level architecture, was integrated into an application called W@ICAR, which proved efficient and intuitive with people not interacting with the robot. It has been validated both from a functional and user experience point of view, showing positive results. Both the pragmatic and the hedonic estimators have shown how many users particularly appreciated the application. 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