A Prover must not verify work they advised on, performed, or hold any financial interest in.

A Prover must disclose, in writing, any relationship or interest that a reasonable observer could see as bearing on their judgement.

A Prover must rotate off a recurring engagement at the interval the Institute sets, so familiarity cannot erode judgement.

A conclusion must rest only on evidence observed in the context the work was done.

A report must represent findings faithfully — neither overstating an outcome nor flattening away its uncertainty.

A Prover must decline or refer any engagement that falls outside their competence.

A Prover must keep records sufficient for another Prover to review the basis of their conclusion.

A Prover must co-operate fully with any complaint or review the Institute conducts.

A breach of this code can lead to conditions, suspension, or withdrawal of certification — heard by a panel that sits apart from the people who confer the marks.