Original: To complete the requirements for a Diplom , one must pass the examinations for the Hauptstudium ( main study period ) that follow the Vordiplom , complete one or sometimes more than one Studienarbeit ( study research project ) , and write a Diplomarbeit ( diploma thesis ) .
Simplified: To win the Diplom certificate , a student must pass the tests for the Hauptstudium ( main study time ) after the Vordiplom , then one or more Studienarbeit ( study research projects ) , and then write a Diplomarbeit ( diploma thesis ) .