Which innovative approach did the creators of the Oxford English Dictionary pioneer that revolutionized dictionary development and is still used in linguistic documentation today?

The Oxford English Dictionary (OED) stands as one of the most significant products in the history of linguistics. Its development revolutionized how we document and understand language evolution. This trivia question explores the fascinating history behind this monumental work that took decades to complete and continues to shape how we understand the English language today. Test your knowledge about this iconic reference work that linguists, scholars, and language enthusiasts consider indispensable.

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Crowdsourcing through 'volunteer readers' who submitted quotations on slips of paper
Using a proprietary algorithm to analyze word frequencies in published texts
Conducting door-to-door surveys to document regional language variations
Implementing a subscription model where users paid for new word additions