In depth
The Second Backward Classes Commission (Mandal Commission) was appointed in 1979 and reported in 1980. Its recommendation of 27% reservation for Other Backward Classes in central services was not acted on until August 1990, when the Government of the day issued an office memorandum. Reservation for SCs and STs already existed.
The memorandum was challenged and the Supreme Court decided the case in 1992. It upheld the 27% quota, but excluded the creamy layer, kept total reservations under Article 16(4) within 50% in ordinary circumstances, barred reservation in promotions for the future, and struck down a 10% economic category added in 1991. The 10% economic idea returned in 2019 through a constitutional amendment (see the entry on EWS reservation).
Data from the Department of Personnel show that OBC representation in central posts rose from about 16.55% in 2012 to 20.46% in 2019. The figures are lower than 27% overall and lower again in senior groups, and the Department of Personnel notes that OBC appointees before 1993 are generally not counted; a committee constituted in 2013 examined why reserved backlog vacancies remained unfilled. Supporters of the policy cite this trend and the legal framework. Petitioners before the Court raised the use of caste as the basis for identification and argued for economic criteria; the creamy-layer direction addressed the question of who benefits within OBCs. These arguments concern principle as well as data.