specific

If you talk about a specific idea, person, group, or thing, you mean that it is different from or more interesting than other things like it; you might also mean that you know exactly which one you are talking about.

Example: The interviewer uses a checklist to make sure that specific areas are covered.

If something is specific, it is detailed, clear, and limited.

Example: Last time, he was happy to do anything, but feels this time he has to be more specific.