Which early 20th century retail innovation first systematically incorporated customer feedback into product design, creating what we now recognize as the modern product development cycle?

Product development has evolved dramatically throughout history, shaping consumer experiences and retail strategies. This poll explores a pivotal moment in retail product development history that fundamentally changed how companies approached customer feedback and product design. Test your knowledge about how historical innovations have influenced modern retail practices and consumer psychology.

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Sears Roebuck's mail-in product review cards (1906)
General Motors' annual model changes based on consumer research (1923)
Montgomery Ward's customer focus groups (1915)
Macy's in-store product testing stations (1911)