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The reasoning behind the method: why frequency-first, why interleaved, why spaced repetition.
What Zipf's law has to do with learning German
A small number of words carry most of everyday German. Here's why learning them in that order, not alphabetically, not by beginner topic, is the whole idea behind this app.
The 80/20 rule, applied to German vocabulary
You don't need 20,000 words to function in German. Research on text coverage shows a small core vocabulary does most of the work, which is the Pareto principle showing up in language.