Possible Duplicate:
“User accounts” or “users account”
should a list of tokens be called a “token list” or a “tokens list”
“Book market” or “books market”

Which one(s) are correct to indicate the division in(to) tasks of a certain undertaking?

1) Task breakdown
2) Tasks breakdown
3) Tasks' breakdown

I would like to understand the "why" of it rather than get an Ngram-like usage statistics chart, please.



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