by George Bradford.
Thank you Gisele.
I did add "username" (a key field in the moodle user data table) to the front of the list. However, when you download the grading sheet, the "username" field isn't included. I'm forced to use as the key field the "Participant" and a number (that are in the first field of the downloaded CSV file), which changes from assignment to assignment.
Following the import grades instructions, you use that downloaded CSV file, add grading data to it, and then upload it back - Moodle uses the "Participant" + Nr as the key field to associate the incoming records to the right individuals. But I cannot get it to read the "username" field instead of "Participant" + Nr field.
-George