Rubrics in Google Sheets can be used by the teacher for actually grading assignments and projects and by students for peer reviews and self reflection. Notice there is a Teacher and Student tab in the example below. Both examples are very similar. The teacher example would include all of the students' names and would probably only be viewed by the teacher. One way to use the student version could be to have have the students' names that are being peer reviewed and eventually be shared with those students when the student reviewing them is done. Another way is to focus on self-reflection. The student would make entries throughout the project to keep track of progress and assess what has been done so far and what still needs to be done.