California, United States of America
The following excerpt is from People v. Thomas, H039990 (Cal. App. 2015):
"To prevail on a claim of ineffective assistance of counsel, a defendant must show both that counsel's performance was deficient and that the deficient performance prejudiced the defense. [Citations.] Counsel's performance was deficient if the representation fell below an objective standard of reasonableness under prevailing professional norms. [Citation.] Prejudice exists where there is a reasonable probability that, but for counsel's errors, the result of the proceeding would have been different. [Citation.]" (People v. Benavides (2005) 35 Cal.4th 69, 92-93.)
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