What's material?:
The new definition in the ASB's Statement on Auditing Standards is:
Misstatements, including omissions, are considered to be material if there is a substantial likelihood that, individually or in the aggregate, they would influence the judgment made by a reasonable user based on the financial statements.
The foundation of the new materiality definition lies in the 1976 U.S. Supreme Court decision TSC Industries, Inc. v. Northway, Inc. which opined that an omitted fact is material if there is a substantial likelihood that a reasonable shareholder would(not could) consider it important in deciding how to vote.
Materiality is determined in the board room between the auditor and the Board. What if all facts were not known at the time of the issuance of the opinion?