One of the aims of building multimodal user interfaces is to make the interaction between user and system as natural as possible in a situation as natural as possible. The most natural form of interaction can be considered how we interact with other humans. While the analysis of human-human communication has resulted in many insights, transferring these to human-machine interactions remains challenging. The automated analysis of the interaction has to consider both semantic and affective aspects, including personality, mood, or intentions of the user, anticipating the counterpart. These processes have to be performed in real-time in order for the system to respond without delays, in a natural environment. The MA3HMI workshop series, now at its 5th edition, brings together researchers working on the analysis of multimodal data as a means to develop technical devices that can interact with humans and react on human’s affects. In particular, artificial agents can be regarded in their broadest sense, including virtual chat agents, empathic speech interfaces and life-style coaches on a smart-phone. In line with the main conference’s theme, we focus on ethical aspect including those in data collection, biasesin model development and in the deployment of systems.
This year's topics are, but not limited to:

• Multimodal environment analyses
• Multimodal understanding of natural interactions’ situation and environment to understand the context of affects
• Affect annotation paradigms for user analyses in natural interactions
• Novel strategies of human-machine interaction in terms of situation and environment
• Multimodal user analyses
• Multimodal understanding of user behaviour and affective state in natural interactions
• Dialogue management using multimodal output
• Multimodal understanding of multiple users behaviour and affects
• Applications, Tools and Systems
• Ethical issues in developing real-time multimodal affective user interfaces
• Novel application domains and embodied interaction
• User studies with (partial) functional systems

The fifth edition of MA3HMI will be held in conjunction with the 9th International Conference on Affective Computing & Intelligent Interaction (ACII 2021).