Power to alter schedules allows central government to amend schedules by notification subject to parliamentary review and modification. Central Government may, by notification in the Official Gazette, alter any provision in the Schedules and such alteration shall operate as if enacted in the Act, taking effect on the date of notification unless otherwise directed; every alteration must be laid before each House of Parliament for a prescribed scrutiny period and may be modified or annulled by both Houses, without prejudice to the validity of prior actions taken under the alteration.