To compute and view the grades, click on the Grades link.  The crowd-grade of a student depends on the submission grade and review grade received by the student.  This creates an incentive for students to both do their homework well, and provide accurate grades and helpful feedback to others. 

The Crowd-Grade received by each student is computed by merging submission and review grades according to the proportions specified in the assignment (a typical proportion is 75% submission grade and 25% review grade).