OST was created within the U.S. Department of the Interior (DOI) by the American Indian Trust Fund Management Reform Act of 1994 (Public Law 103-412) to improve the accountability and management of Indian funds held in trust by the federal government. As trustee, DOI has the primary fiduciary responsibility to manage tribal trust funds and Individual Indian Monies (IIM) accounts, as well as the resources that generate the income for those accounts.