The Minister may on the recommendation of the Director-General, and after consultation with the Board and the chairpersons of the medical advisory panels, amend Schedule 3 by notice in the Gazette, also with retrospective effect, in respect of the description of the diseases and work: Provided that at least 60 days before any such amendment a notice shall be published in the Gazette--
a) of the intention to effect an amendment and the proposed content of the amendment; and
b) in which any person who wishes to comment on the proposed amendment is invited to submit such comment in writing to the commissioner within the period mentioned m the notice.