Students are required to earn 30 credits in order to graduate. The provincial requirements to successfully earn an Ontario Secondary School Diploma (OSSD) changed in September of 1999. Students entering Grade 9 on or after September 1999 would earn the updated version of the OSSD (1999). Students entering Grade 9 before September 1999 would earn the original version of the OSSD (1989). The following pages outline the criteria that must be satisfied in order to earn each diploma.