Which language learning company created the marketing term 'comprehensible input' that revolutionized how language acquisition products were positioned to consumers?

In retail linguistics, certain terms have revolutionized how language-learning products are marketed. This poll explores a fascinating linguistic marketing innovation that transformed consumer perception of language learning tools. Understanding these linguistic retail strategies helps reveal how language product companies position themselves and create distinct brand identities through carefully chosen terminology.

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Rosetta Stone with their 'Dynamic Immersion' approach
Stephen Krashen's theories, later commercialized by TPRS (Teaching Proficiency through Reading and Storytelling) products
Duolingo with their 'gamification' methodology
Pimsleur with their 'Graduated Interval Recall' technique