What is the test for ineffective assistance of counsel?

A court must indulge a strong presumption trial counsel's conduct falls within the wide range of reasonable professional assistance. Tactical errors are generally not deemed reversible. Counsel's decisionmaking is evaluated in the context of the available facts. To the extent the record fails to disclose why counsel acted or failed to act in the manner challenged, appellate courts will affirm the judgment unless counsel was asked for an explanation and failed to provide one or unless there simply could be no satisfactory explanation. Prejudice must be affirmatively proved. The record must demonstrate a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different. (People v. Maury (2003) 30 Cal.4th 342, 389.)

On direct appeal, reversal of a conviction for ineffective assistance of counsel will only occur if: (1) the record affirmatively discloses counsel had no rational tactical purpose for the challenged act or omission, (2) counsel was asked for a reason and failed to provide one, or (3) there could be no satisfactory explanation for counsel's choices. All other claims of ineffective assistance of counsel are more appropriately resolved in a habeas corpus proceeding. (People v. Mai (2013) 57 Cal.4th 986, 1009.)