Mental models are deeply ingrained assumptions and generalizations that influence how people understand the world. They are shaped by experiences and knowledge. The presentation discusses how mental models affect perception and action, and how considering different stakeholders' mental models is important for understanding their diverse perspectives. It provides examples of how two men from Argos may have different views of Athens due to their experiences, and how employees, customers, and other groups related to a company may have varying perspectives influenced by their own mental models.