Committee appointments under tax provision establish a three-year membership for the National Committee for Promotion of Social and Economic Welfare. The Central Government, exercising powers under the Income-tax Act provision and the Income-tax Rules, reconstitutes the National Committee for Promotion of Social and Economic Welfare by appointing a Chairman and thirteen members named in the notification, and fixes their tenure to commence on the notification date for a prescribed three-year period, thereby formally establishing the Committee's membership and operational authority under the governing statutory framework.