What constitutes ineffective assistance of counsel?

Rainey argues that he received ineffective assistance of counsel when defense counsel did not request a discharge of the jury after the third note indicating a deadlock, and when he did not object to the trial court's request for two lists. The question is whether defense counsel's acts or omissions fell outside the wide range of professionally competent assistance, and whether those acts or omissions were prejudicial. (Strickland v. Washington (1984) 466 U.S. 668, 691-692.)