[adrianN]

I don't think domain specific packs are very useful for language learners. You need a rather large vocabulary just to follow a normal everyday conversation. Basic conversation and reading skill are the foundation upon which you can build. You need to consume and produce a large amount of material in your target language if you want to master it.

Buying the language a few hundred words at a time won't get you to fluency as quickly as learning words by frequency until you have covered the most frequent ~80%. Only then does it make sense to focus on specific domains that are most interesting to you.

[bravura]

Actually, it does make sense to have packs that are structured in a particular way.

For example, I am learning German. I would rather have a pack with the 25 most frequent nouns, 25 most frequent verbs, and maybe 25 most frequent adjectives. Then I have a foundation of vocabulary to learn the dativ and akkusativ. I don't need the adverbs yet.

Also, if I'm learning the modal verbs, I'd like a pack of those.

[huhtenberg]

Domain packs are not for those who are trying to master a language, but those who are starting up and merely need to pick up some day-to-day vocabulary quickly.