Provisions in Articles 15 and 16 enabling reservation for Scheduled Caste/ Scheduled Tribes (SC/ST) and Socially and Educationally Backward Classes (SEBC) do not form part of the basic structure of the Constitution, Justice Dinesh Maheshwari held on Monday in the case relating to reservation for Economically Weaker Sections (EWS) [Janhit Abhiyan v. Union of India & Ors.].