Each comment or question in Perusall is automatically scored by the system and rated as below expectations, meets expectations, or exceeds expectations. In your course settings, you decide how many points each of these categories should be worth (by default 0, 1, and 2 points, respectively).
You can also set the following parameters in your course settings:
If you set a "post-deadline reply window" in your course settings, students can respond to existing comments or questions for full credit for a certain amount of time after the deadline. (This is to encourage students to respond to each other's questions and comments even when the initial question or comment is made close to the deadline.) However, note that students cannot earn more credit after the deadline by entering responses than they have already earned from their work before the deadline. (This check exists to prevent students from simply starting the assignment after the deadline and earning full credit by simply responding to other students' questions or comments.)
If you set a "late annotation period" in your course settings, Perusall will automatically award partial credit for annotations made after the deadline based on when the comment was made. For example, comments made three-quarters through the late annotation period will receive 25% of the credit they would have received if made on time.
Each assignment is graded automatically once the final opportunity for students to change their scores has passed. (If you have neither a post-deadline reply window nor a late annotation period for your course, this is just the assignment deadline; if one or both of these periods are set, then the assignment will not be graded until both have passed.) Scores for each assignment will show up in your gradebook, but will not appear to students until you have released the scores.