According to NDB Accountants and Consultants:
"SSAE 16 effectively replaces Statement on Auditing Standards No. 70 (SAS 70) for service auditor's reporting periods ending on or after June 15, 2011. Two (2) types of SSAE 16 reports are to be issued, a Type 1 and a Type 2. Additionally, SSAE 16 requires that the service organization provide a description of its "system" along with a written assertion by management."
SAS 70, short for Statement on Auditing Standards No. 70, has been around since 1992. Data centers widely embraced SAS 70 to show customers and partners that they had proper business controls in place.
The replacement, SSAE 16, is short for Statement on Standards for Attestation Engagements (SSAE ) No. 16. SSAE 16 is promoted by the Auditing Standards Board (ASB) of the American Institute of Certified Public Accountants (AICPA).
SSAE 16 keeps pace with the "growing push towards more globally accepted international accounting standards," according to NDB Accountants and Consultants.