So, you've just interviewed 5 candidates, 2 were dire, 2 were ok, and one was a star.  You're obviously recruiting the star, but what about feedback for the others?

This is where the word 'demonstrate' comes in.  If you say the candidate can't add up, then the candidate can argue that outside of the interview he can add up.  If you say the candidate did not demonstrate that he could add up during the interview, he can't argue!

For the two candidates who were ok, 'sufficient' becomes your best friend.  The candidate did not demonstrate sufficient understanding of the standard analytical tools, means he knew a bit, but not enough.

Finally, if you are still struggling then use 'as other candidates'.  The candidate did not demonstrate the ability to problem solve as well as other candidates.

Feedback in three easy steps!