What is the test for ineffective assistance of counsel?

The standards governing claims of ineffective assistance of counsel are well established. The defendant must prove both that (1) counsel's performance "fell below an objective standard of reasonableness" and (2) counsel's deficient performance prejudiced the defendant, resulting in an unreliable or fundamentally unfair outcome in the proceeding. Strickland v. Washington, 466 U.S. 668, 687-88 (1984). "The assessment of prejudice should proceed on the assumption that the decisionmaker is reasonably, conscientiously, and impartially applying the standards that govern the decision." Id. at 695.