"The main differences between the three types of engagements are the scope of services performed and the level of assurance provided. A compilation is simply financial statement preparation by the auditor based on representations from management. In a compilation, the auditor is not required to provide any assurance that the financial statements are accurate and free from errors/fraud. A review is more involved, and requires the auditor to perform analytical procedures and inquiries of management to ascertain that information contained in the financial statements is correct. In a review, the auditor provides limited assurance that the financial statements do not require any material modifications. In an audit, the auditor provides assurance that the financial statements are free of material misstatement or errors. This requires the auditor to expand the scope of the engagement to test ending balances, perform tests of internal controls, acquire third party confirmations and physically confirm assets, among other procedures."