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It really depends on the specific usage, unfortunately! In the example you gave, the idiom is "required to <infinitive>". For that kind of set-up in general, I'd ask yourself whether it makes sense to say "in order to" - eg, more info is required in order to determine blah blah blah. If so, use the "to" form.
If you come across more examples in your study that don't fit the "in order to" pattern, come back and ask again. You can excerpt just that sentence if you don't want to post the entire problem.
_________________ Stacey Koprince Instructor Director of Online Community ManhattanGMAT
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