Which company first introduced 'design thinking' as a formal product development methodology that emphasized human-centered design and rapid prototyping?

Product design has transformed our world through countless innovations and discoveries. Some design breakthroughs have completely revolutionized how we interact with everyday objects. This poll tests your knowledge about a significant design innovation that changed an entire industry and influenced countless products we use today. Can you identify the correct origin of this groundbreaking design approach?

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IDEO (1991)
Apple (1984)
Braun (1955)
Bauhaus School (1919)