(a) Engineers shall practice only in their areas of competence.(b) The engineer shall not perform any engineering assignment for which the engineer is not qualified by education or experience to perform adequately and competently. However, an engineer may accept an assignment which includes phases outside of the engineer's area of competence if those other phases are performed by qualified licensed professionals, consultants, associates, or employees.(c) The engineer shall not express an engineering opinion in deposition or before a court, administrative agency, or other public forum which is contrary to generally accepted scientific and engineering principles without fully disclosing the basis and rationale for such an opinion. Engineering opinions which are rendered as expert testimony and contain quantitative values shall be supported by adequate modeling or analysis of the phenomena described.