AccountAbility's AA1000 series are principles-based standards to help organisations become more accountable, responsible and sustainable. They address issues affecting governance, business models and organizational strategy, as well as providing operational guidance on sustainability assurance and stakeholder engagement. The AA1000 standards are designed for the integrated thinking required by the low carbon and green economy, and support integrated reporting and assurance.
The standards are developed through a multi-stakeholder consultation process which ensures they are written for those they impact, not just those who may gain from them. They are used by a broad spectrum of organisations -- multinational businesses, small and medium enterprises, governments and civil societies.

Initially released in June 2000, International Standard on Assurance Engagements (ISAE 100) was designed to provide a basic framework for large scale audits concerned with non-financial data process monitoring. These types of audits include environmental, social and sustainability reports; auditing of information systems, internal control, and corporate governance processes; and compliance audits for grant conditions, contracts and regulations.
Three years later, to clarify the definition of "moderate assurance engagements," ISAE 3000 was established to further address ethical requirements; quality control; engagement acceptance; planning; expert materials; obtaining evidence; documentation; and preparing assurance reports.