The General Certificate of Education (GCE) Ordinary Level, also called the O-level or O level, was a subject-based academic qualification. Introduced in 1951 as a replacement for the 16+ School Certificate (SC), the O-level would act as a pathway to the new, more in-depth and academically rigorous A-level (Advanced Level), in England, Wales and Northern Ireland.[citation needed] Later, the complementary and more vocational Certificate of Secondary Education (CSE) was added to broaden the subjects available and offer qualifications in non-academic subjects.
The O-Level and CSE were replaced in the United Kingdom in 1988 by the GCSE[1] and later complementary IGCSE exams. The Scottish equivalent was the O-grade (replaced, following a separate process, by the Standard Grade). An O-level branded qualification is still awarded by Cambridge International Examinations in select locations.