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Perusall analytics provide a lot of tools to let you evaluate how students are doing on assignments, including:
where students spent the most time
where students had the most questions
when students were working on assignments
You can annotate content TWO different ways.
A text-based document can be highlighted using the cursor.
An image, figure, or document where the cursor highlighting doesn't work can be annotated using the Annotate Figure button, at the top of your Perusall page. The default is the cursor to annotate text, but all you have to do is click the button and you can highlight anything!
Perusall's grading structure is based on a variety of metrics which you can adjust. Faculty who have done so recommend making changes incrementally. You may find it helpful to begin with Perusall's default scoring but also grade the assignments manually. Then, compare the results and adjust Perusall's scoring metrics accordingly.
Gradebook settings in Perusall are accessible via "Settings" -> "Scoring".