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I have the following phrase:
...could be the early detection of users who are likely to under-participate in the activity, as well as users who are likely to perform enough as required.
In this sentence, I wonder if I should better put the before each users or it is not necessary. As far as I know, there should be since the 'users' are further specified, but then it sounds a little redundant as well. Can someone help?
It depends on how you can answer the question "which users?"
If your answer is "doesn't matter" or "any possible group of users who are likely to under-participate in the activity", then no article is needed.
If your answer is something like "a definite group of users, who are likely to under-participate in the activity, that I saw or was talking about before", use the.
If your answer is something like "well, I saw multiple groups of users, who are likely to under-participate in the activity, and I'm talking about at least one but not all of them", use some.
Who qualifies "users" but doesn't really affect the choice of article.
No "the" is required the way I see it.
You have two global categories of users that are unspecified.
See example:
