; and (B) the recidivism reduction programs that will best minimize the risk that the prisoner will recidivate upon release from prison. (4) Productive activity The term productive activity means either a group or individual activity that is designed to allow prisoners determined as having a minimum or low risk of recidivating to remain productive and thereby maintain a minimum or low risk of recidivating, and may include the delivery of the programs described in paragraph (1) to other prisoners. . (b) Clerical amendment The table of subchapters for chapter 229 of title 18, United States Code, is amended by adding at the end the following: D. Risk and Needs Assessment System 3631 . 102. Implementation of system and recommendations by Bureau of Prisons (a) Implementation of system generally Section 3621 of title 18, United States Code, is amended by adding at the end the following: (h) Implementation of risk and needs assessment system (1) In general Not later than 180 days after the Attorney General completes and releases the risk and needs assessment system (referred to in this subsection as the System ) developed under subchapter D, the Director of the Bureau of Prisons shall, in accordance with that subchapter— (A) implement and complete the initial intake risk and needs assessment for each prisoner (including for each prisoner who was a prisoner prior to the effective date of this subsection), regardless of the prisoner’s length of imposed term of imprisonment, and begin to assign prisoners to appropriate evidence-based recidivism reduction programs based on that determination; (B) begin to expand the effective evidence-based recidivism reduction programs and productive activities it offers and add any new evidence-based recidivism reduction programs and productive activities necessary to effectively implement the System