A letter report issued by the Government Accountability Office with an abstract that begins "GAO and others have shown that successful organizations use strategic workforce planning to help meet present and future mission requirements. Although agency approaches to strategic workforce planning can vary depending on needs and mission, GAO and the Office of Personnel Management have identified six leading principles that workforce planning should address. The Appropriations Committees directed GAO to review workforce planning at the Department of the Interior (Interior), the Environmental Protection Agency (EPA), and the Department of Agriculture's Forest Service. GAO examined (1) workforce planning processes used at each agency, (2) the extent to which these processes incorporate the six principles, and (3) how, if at all, the agencies link workforce planning with the annual budget allocation processes. GAO reviewed agencies' workforce plans, strategic plans, and budget documents and interviewed human resources, planning, and budget officials."