Notes: In audit of SS 540 or BS 25999, internal audits are referred to as first party audits. Organizations use internal first party audits to audit themselves for internal purposes. This audit need not be conducted in-house as it can be carried out by an external organization. The use of first party audits to declare that the organization complies with the standard. This is called a self-declaration.

(Source: Business Continuity Management Institute - BCM Institute)