As a general rule, applications will not be systematically scrutinised after leaving the Search Division in order to verify the correctness of the official classification assigned by the examiner. Principal Directorate Tools may, however, institute such sampling check procedures as are deemed necessary to ensure correctness and uniformity in the application of the IPC. It is, of course, for the director to arrange for such checks as he considers necessary, having regard to the experience of his examiners, before the applications leave his directorate.

The ultimate responsibility in deciding classification matters lies with Principal Directorate Tools.