How can I tell what online assessments have been assigned to students?

To see what assessments have been assigned, go to the Measures tab, select the grade, then scroll down through the measures. To the right of the measure name, there is a column named "Online". If the box is checked in blue to the left of the Take Online feature, then the measure has been assigned to be taken online.

To see what Groups/Students have been assigned that measure, click on the blue  "Show options" link. A drop-down menu will appear and those groups with a check in the box next to their name are the ones assigned that particular measure. If you click on the Take Online box instead of the Show options link, you will unassign the measure.