The National Institutes of Health (NIH) has selected the Clinical Trials Transformation Initiative (CTTI) to support a workgroup that will develop a comprehensive plan for assessing the NIH’s new single institutional review board (sIRB) policy. The policy, which became effective in January, requires U.S. sites participating in nonexempt multicenter human subjects research funded by the NIH to use a sIRB for ethical review, with the goal of improving the quality and efficiency of clinical research.