@Tristan,

I think this is a good idea, but am not sure how to implement it so would welcome specific suggestions. Right now the best someone can do to add words in fits and starts is to manually add them from the HSK vocabulary lists.

The problem is figuring out what words people know. Perhaps we should have a more systematic way for people to say they want to learn all of the vocabulary over X months. Then we could adjust the amount of vocabulary they're presented with daily/weekly/monthly based on their targets.

Again, I'd welcome specific suggestions of solutions people would like to have us implement. :)

--dave