ISAE 3000 is the standard for assurance engagements other than audits or reviews of historic financial information.
ISAE 3000 is issued by the International Auditing and Assurance Standards Board (IAASB).
The standard consists of guidelines for the ethical behavior, quality management and performance of an ISAE 3000 engagement.
Generally ISAE 3000 is applied for audits of internal control, sustainability and compliance with laws and regulations.
A type 1 report provides assurance on the suitability of design and existence of controls and type 2 report provides assurance on suitability of design, existence and operational effectiveness.