What is the test for ineffective assistance in a personal injury case?

"In order to demonstrate ineffective assistance, a defendant must first show counsel's performance was deficient because the representation fell below an objective standard of reasonableness under prevailing professional norms. [Citation.] Second, he must show prejudice flowing from counsel's performance or lack thereof. Prejudice is shown when there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different. A reasonable probability is a probability sufficient to undermine confidence in the outcome. [Citation.]" (People v. Williams (1997) 16 Cal.4th 153, 214-215.)