; (ii) in subparagraph (B)(ii), by striking section 3553(b) and inserting section 3553(c) ; and (iii) in subparagraph (C), by striking section 3553(c) and inserting section 3553(d) ; (B) in subsection (g)(2), by striking section 3553(c) and inserting section 3553(d) ; and (C) in subsection (j)(1)(B), by striking section 3553(b) and inserting section 3553(c) . 203. Post-sentencing risk and needs assessment system (a) In general Subchapter C of chapter 229 of title 18, United States Code, is amended by inserting after section 3621 the following: 3621A. Post-sentencing risk and needs assessment system (a) In general Not later than 30 months after the date of the enactment of this section, the Attorney General shall develop for use by the Bureau of Prisons an offender risk and needs assessment system, to be known as the Post-Sentencing Risk and Needs Assessment System or the Assessment System , which shall— (1) assess and determine the recidivism risk level of all prisoners and classify each prisoner as having a low, moderate, or high risk of recidivism; (2) to the extent practicable, assess and determine the risk of violence of all prisoners; (3) ensure that, to the extent practicable, low-risk prisoners are grouped together in housing and assignment decisions; (4) assign each prisoner to appropriate recidivism reduction programs or productive activities based on the prisoner’s risk level and the specific criminogenic needs of the prisoner, and in accordance with section 3621(h)(4); (5) reassess and update the recidivism risk level and programmatic needs of each prisoner pursuant to the schedule set forth in subsection (c)(2), and assess changes in the prisoner’s recidivism risk within a particular risk level