The terms of reference of the audit committee should also require it:
(a)    to review arrangements employees of the issuer can use, in confidence, to raise concerns about possible improprieties in financial reporting, internal control or other matters. The audit committee should ensure that proper arrangements are in place for fair and independent investigation of these matters and for appropriate follow-up action; and
(b)    to act as the key representative body for overseeing the issuer's relations with the external auditor.