Abstract: The present invention is directed to a responsive online system that monitors a customer's biometric information to measure satisfaction levels. Preferably, the system automatically communicates information about a customer to the online system, without requiring explicit user action. The biometric information measured may be the electrical resistance of the customer's skin, finger pressure, pulse rate, audio or visual images, or other information. Because the system measures the customer's biometric information as the customer uses the online system, the system can respond dynamically and quickly to the user's stress levels.