In each student's row, you'll see the status of their assignments. Hover over the status and a tooltip will pop up with more information. To turn off tooltips, uncheck the box at the top left of the gradebook.
There are four possibilities for assignment status:
Lab not runA dash in the gradebook means the student never opened the lab or started the assessment.
There are two types of pending status:
Assessment not submittedThe student has started the lab, but hasn’t submitted the assignment yet.
Pending RedoYou've allowed the student to redo the lab and are waiting for a new assignment to be submitted.
GradeThe student has submitted an assignment, but you haven't assigned a grade. This link is turquoise in color.