I'm building a language learning app for children in 9th to 12th grade and am collecting the metrics I'll need to test its effectiveness.
I'm going to be doing another round of beta testing at local schools, and so far my plan is:
There are 36 weeks in a school year. There seem to be around 10-15 chapters in a textbook on average (a few textbooks I've seen). This means it takes around 2 to 3 weeks per chapter.
In my first beta test I covered around 75 words in 2 hours. After the beta, they were able to recall about 15 words, or 20%. The retention curve shows about 45% of words will be retained after 2 hours. I think I inundated the poor souls with too many words.
Narrow the scope of a beta test to the equivalent amount of grammar / words taught in a chapter
My question is: About how many words are typically taught in 1 chapter of a foreign language textbook?
If only 30-40 are taught over 2 weeks for a chapter, that's 10 school days, so 40/10 = 4 words per day, giving them much more time to study/remember a fraction of the words.