Subsequent conclusions fault the intelligence community for failing to adequately explain to policymakers the uncertainties that underlay the NIE's conclusions, and for succumbing to "group think," in which the intelligence community adopted untested (and, in hindsight, unwarranted) assumptions about the extent of Iraq's WMD stockpiles and programs. The committee identified a failure to adequately supervise analysts and collectors, and a failure to develop human sources of intelligence (HUMINT) inside Iraq after the departure of international weapons inspectors in 1998. It also cited the post-9/11 environment as having led to an increase in the intensity with which policymakers review and question threat information.