Which groundbreaking customer feedback methodology was first developed in the 1940s to systematically test consumer products before full market launch?

Before products hit the market, companies invest significant resources in gathering customer feedback. This critical step in product development has evolved dramatically over the decades, with various methodologies emerging to better understand consumer preferences and behavior. This trivia question explores a pioneering innovation in how inventors and companies collect and analyze customer feedback to refine their discoveries and inventions before mass production.

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