You can take a look at the assignment of your employees in MyJAM! by going to the button Assignments (as displayed below). You'll immediately have an oversight of all of your employees.
At the right top you can click on Columns to either show or hide various traits of your employees (like the authorization unit or contract hours, as seen below). At the left top is a simple Excel button for an offline document of your employees.
Do you spot a red circle with an exclamation mark or number in the left menu next to Assignments? That means that there's action required for one or more of your employees. Click on the red circle to be forwarded to the concerning required action. Usually, this notification means that an assignment has been expired.