(1) Licensees shall perform services only in the areas of their competence gained through education or verifiable experience.

(2) Licensees shall not affix their signatures or seals to any plans or documents dealing with subject matter in which they lack competence, nor to any such plan or document not prepared under their responsible charge.

(3) If a question arises as to the competence of a licensee in a specific technical field which cannot otherwise be resolved to the board's satisfaction, the board, upon request of the licensee or on its own volition, may require that the licensee take an appropriate examination.