The document discusses human abilities relevant to human-computer interaction (HCI) design. It covers the senses of vision, hearing, and touch and how understanding human capabilities with these senses can inform interface design. For example, it notes that font size and location should depend on the task based on what we know about visual acuity. It also briefly outlines the memory systems and cognitive processes involved in information processing that will be covered in more detail next time. The motor system and how understanding human abilities there can improve design, such as providing feedback and minimizing eye movement, is also introduced.