23. Feedback
A. Introduce feedback.
B. If feedback already exists, reverse it.
Example:
• Water pressure from a well is maintained by sensing output pressure and turning on a pump if pressure is too low.
• Ice and water are measured separately but must combine to total a specific weight. Because ice is difficult to dispense precisely, it is measured first. The weight is then fed to the water control device, which precisely dispenses the needed amount.
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