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Designing and analyzing systems is a hallmark of engineering work. Engineers take requirements, plan how parts fit together, and create models or simulations to predict how a whole system will behave. They test and refine designs, considering safety, reliability, performance, and cost, and they optimize components and interfaces to work smoothly as a single functioning whole. This applies across fields—civil engineers plan bridges and water networks, electrical engineers design circuits and power grids, and software engineers shape the architecture and data flow of programs. While nurses, teachers, and firefighters perform vital roles focused on care, education, and emergency response, they don’t center their work on designing and analyzing complex systems. So the role most associated with that work is the engineer.