The Science
Built on decades of research into how people learn.
Passage is designed by educators. The principles below are long-established in learning research, and they are structural to the product rather than features added on top of a fixed course.
Retrieval practice
Learning is strengthened by recalling something, not by seeing it again. Passage asks you to produce and choose far more often than it asks you to review, and it treats a recalled answer as stronger evidence than a recognised one.
Spaced learning
Material returns across widening intervals rather than in one sitting. Spacing is applied to what the system judges worth returning to, so time away costs you nothing but the time itself.
Interleaving
Skills and structures are mixed rather than blocked. Mixing feels harder in the moment and holds up better later, because it trains you to decide which knowledge applies, not just to apply it.
Contextual learning
Words and forms appear inside sentences, situations and audio that give them meaning. Language learned in context is easier to retrieve in context, which is where you will need it.
Corrective feedback
Feedback arrives while the attempt is still live, and it explains the difference between what you chose and what works. A wrong answer is a teaching moment, not a penalty.
Discrimination practice
Many Japanese errors are confusions between near neighbours — similar particles, similar readings, similar forms. Passage deliberately places confusable items side by side so the distinction is what gets learned.
What we don't claim
We don't publish invented statistics, and we don't promise outcomes that depend on you. Progress in a language is the result of sustained, well-directed effort; Passage exists to make sure the effort is well-directed.
What we do claim is narrower and testable: Passage understands where you are, it knows what comes next, and it creates the practice that follows from that — built around how learning works.