As for reporting requirements for service organizations, SSAE 16 requires a description of one’s “system” along with a written assertion by management, whereas SAS 70 requires a description of “controls” and no written assertion. The key difference between the SSAE 16 description of its “system” and the SAS 70 auditing standard’s description of “controls” is that many organizations may find themselves having to revise their prior descriptions to meet the new requirements for SSAE 16 reporting.