The third working group focused on the discussion of boundaries in the context of individual sovereignty rights and interactions between entities. The group explored various types of boundaries, such as physical, intellectual, psychological, emotional, cellular, and societal/cultural. They aimed to practically identify and define boundaries in a way that humans can understand and machines can operate based on those definitions. Two approaches are discussed: using Markov blankets to identify boundaries based on correlations, and describing boundaries to allow humans to understand and respect them. The group also considered applications in areas like software systems, video games, computer security, and biological contexts. They highlighted the importance of formalizing boundaries and suggested reinforcement learning and human feedback.