Which groundbreaking invention from the 1970s revolutionized customer feedback collection and is considered the precursor to modern online review systems?

In the world of retail and customer experience, innovations have transformed how businesses understand their customers. The systematic collection of customer feedback represented a paradigm shift in how companies improved their products and services. This trivia question explores a pivotal moment in the evolution of customer feedback methodology that changed business forever.

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• The Customer Satisfaction Card developed by IBM in 1973
• The Portable Electronic Consumer Response System (PECRS) created by Xerox PARC in 1979
• The Happy Or Not feedback terminal invented by Heikki Väänänen in Finland
• The 'How Am I Doing?' comment card system pioneered by Herb Kelleher at Southwest Airlines

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