ISAE 3402 is an assurance standard. The title is "Assurance Reports on Controls at a Service Organization". It was published in June 2011 as a standard for documenting that a service organisation has adequate internal controls; although often approached from a financial reporting perspective, such as Sarbanes-Oxley, it can also be applied to other controls, such as information security. ISAE stands for "International Standard for Assurance Engagements".
Like SAS 70 and SSAE 16, ISAE 3402 prescribes Service Organization Control reports, which help give assurance to the organisation's customers and service users, who may have their own assurance needs. There are two kinds of SOC reports:
ISAE 3402 was developed by the International Auditing and Assurance Standards Board, but it is also supported by the IAASB (International Auditing And Assurance Standards Board) and IFAC (International Federation of Accountants). It supersedes SAS 70, and puts more emphasis on procedures for the ongoing monitoring and evaluation of controls.