California Code, Elections Code - ELEC § 13218

(a) The Secretary of State shall establish a ballot design advisory committee to assist the Secretary of State to promulgate regulations that prescribe ballot design and format.

(b) The ballot design advisory committee shall consist of the Secretary of State, or the secretary's designee, and members to be appointed by the Secretary of State who are recognized ballot design experts and county elections officials or a designee of a county elections official.  Each recognized ballot design expert shall have demonstrated experience with ballot design requirements and knowledge of presenting election materials to voters using plain language methods or another method that is easy for voters to access and understand.