(a) For contracts requiring professional services or specialization, or expertise in a particular field, the Board of School Commissioners shall authorize the Superintendent to invite proposals for such services. The Superintendent, acting as Purchasing Agent for the School Department, shall submit his or her selection or selections to the Board of School Commissioners for confirmation.

(b) For contracts requiring professional services or specialization, or expertise in a particular field, the Board of Aldermen shall authorize the Mayor to invite proposals for such services. The Mayor, after consultation with the City Purchasing Agent and the department head involved, shall submit his or her selection or selections to the Board of Aldermen for confirmation.