Which discipline focuses on understanding how humans interact with elements of a system and designing accordingly?

• A. Human factors
• B. Ergonomics
• C. Human information processing system
• D. Percentile range

Answer: (A)

Understanding how people interact with a system and designing to fit those interactions is what human factors is about. This discipline studies what people can perceive, understand, and do within a given environment and how tools, tasks, and interfaces affect performance, safety, and comfort. By focusing on users’ abilities, limits, and mental models, designers create systems that are easier to use and less error-prone, ensuring the overall experience is efficient and safe. Ergonomics is closely related and often overlaps, but human factors is the broader umbrella that includes cognitive and organizational aspects, not just the physical fit. The other options don’t describe a design discipline: a cognitive model of information processing explains mental steps, not how to design systems; percentile range is a statistical measure unrelated to design.