Tips for Nominators:
As this letter of nomination serves as the primary criteria,
  please be as detailed as possible.
Highlighting the student’s involvement can only help the
  review committee clearly understand the student’s impact
  on the University and in the surrounding community.
Recognize any student who informally makes a significant
  contribution (i.e. mentoring, bridging social connections,
  volunteering).
Speak to colleagues about the student’s involvement (i.e.
  the student’s department representative, his or her peers).
Feedback from other sources may also be included in
  your letter.
If submitting letter of recommendation online, please
  send via attachment to spirit@princeton.edu