I have seen (and I have also used myself) the phrase “research-level questions in theoretical computer science” to describe the scope of cstheory.stackexchange.com.
However, thinking about it, I believe that the word “research-level” in this context means something like “which arise or can arise in research in TCS”. In other words, if a TCS question arises in research in an applied field and it is too easy for TCS research, I do not think that it is usually called a “research-level question in TCS”.
This seems too restrictive given that the consensus, though still being developed, seems to be to allow easy questions in TCS as long as they are not something like homework or typical exercises in textbooks and the asker has done reasonable due diligence (see the discussion “On the feasibility of homework questions” started by Raphael and the comments on the question “Is the following problem NP-Hard?”).
Therefore, I want a better description of the scope. What is your take?