Which term refers to information used to adjust a system based on measured output?

• A. Input
• B. Feedback
• C. Output
• D. Process

Answer: (B)

When a system uses information about its own performance to make changes, that information is feedback. It closes the loop by taking the measured output and using it to adjust the input so the output moves toward the desired result. For example, a thermostat measures the actual temperature (the output), compares it to the setpoint, and uses that difference to control heating or cooling. The input is what you apply to drive the system, the output is what the system produces, and the process is the sequence of steps that convert input into output. Feedback is the information that lets the system correct itself based on how it actually performs.