Federal Rule of Civil Procedure 12(b)(6) allows the defense of "failure [of a complaint] to state a claim upon which relief can be granted." The Center conducted the study at the request of the Advisory Committee on Civil Rules of the Judicial Conference of the United States and its reporter, Professor Paul Carrington. After considering the data in the paper at its April 1989 meeting, the Advisory Committee decided not to change Rule 12(b)(6).