The Assembly page contains fields that are used for upcoming tests and different fields that are used for upcoming notifications. 

The Last Tested At field is the date an assembly was last tests. The Next Test Due field is the next date that you want this assembly to be tested next. See our article about the Upcoming Tests page to learn more.

The Last Notified At field shows the last date a notification was sent for this assembly. The Notification Month reflects the month that you notify customers their assembly is due to be tested.