Based on Johns Hopkins research on dropout prevention by Dr. Robert Balfanz, the Early Warning System uses Attendance, Behavior and Course Grades (ABC's). The EWS identifies students in middle school, before they dropout.
Participation is voluntary. Please see the FAQ at http://www.portal.state.pa.us/portal/server.pt/community/early_warning_system/21791
The fields can be found Start Page > District Setup > Courses > New Course and Start Page > School Setup > Courses > Edit Course District Information.