Currently, there are two tools that faculty can use to provide feedback.
For Fall 2018, all campuses except IU Bloomington will be using the Student Engagement Roster (SER). The SER allows for a much broader range of feedback to students, including the ability for faculty to send a specific note.
The Student Performance Roster (SPR) has been in use since 2011 and allows faculty to identify issues students may be experiencing in a course and to make recommendations about how to improve performance. IU Bloomington faculty may use either tool. Be sure to ask your instructor which tool they will be using.