International Standards on Auditing (ISA) are standards or guidelines that auditors follow when conducting a financial audit of a companys financial statements in those jurisdictions that have adopted ISAs or some version of ISAs. These standards are issued by the International Federation of Accountants (IFAC) through the International Auditing and Assurance Standards Board (IAASB). ISA covers a wide variety of ground. It designates specific responsibilities of an auditor including how to plan an audit; how to evaluate and conclude on the adequacies of internal controls.