From the press release:
GPO Releases United States Policy and Supporting Positions
The U.S. Government Publishing Office (GPO) has made the 2016 United States Policy and Supporting Positions, or the “The Plum Book”, available on govinfo and as a mobile web app (no download required). Previous editions of the Plum Book, back to 1996, are also available on govinfo.
Plum Book for 2016
Browse all editions of the Plum Book, 1996-2012
Plum Book mobile web app
About the Plum Book
Published by the Senate Committee on Homeland Security and Governmental Affairs and House Committee on Government Reform alternately after each Presidential election, the Plum Book lists over 9,000 Federal civil service leadership and support positions in the legislative and executive branches of the Federal Government that may be subject to noncompetitive appointment, nationwide. The duties of many such positions may involve advocacy of Administration policies and programs and the incumbents usually have a close and confidential working relationship with the agency or other key officials.
The list originated in 1952 during the Eisenhower administration. For twenty-two years prior, the Democrats controlled the Federal Government. When President Eisenhower took office, the Republican Party requested a list of government positions that President Eisenhower could fill. The next edition of the Plum Book appeared in 1960 and has since been published every four years, just after the Presidential election.