Films and videos are normally classified by at least two examiners using the published Guidelines. In most cases the decision is ratified by a senior officer, but if the examiners are in any doubt or fail to agree, or if important policy issues are involved, the work may be seen by other members of the Board up to, and including, the Director and President. Occasionally it is necessary to take specialist advice about the legal acceptability of film content or its potential for harm.