Which product design methodology, adopted by major literary publishers in the 2010s, involved readers in the creation process before a book's final draft was complete?

In the publishing world, understanding reader feedback has transformed how books are designed and marketed. From cover art to digital formatting, publishers have developed sophisticated methods to collect and implement reader insights. This poll tests your knowledge about a groundbreaking product design technique that changed how publishers approach book creation. Can you identify the innovative methodology that revolutionized the relationship between authors, publishers, and readers?

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Reader Experience Mapping (REM)
Beta Readers Program
Literary Focus Groups (LFGs)
Narrative A/B Testing