; (I) whether the Administration changed any contract term or deliverable for the program or project and, if so, a description of the change, why it happened, and the impact to the cost of the program or project; (J) benefits promised with respect to the program or project at initiation; (K) benefits delivered with respect to the program or project as of the date of the report; (L) whether the program or project was cancelled and, if so, a description of why and when; (M) for cancelled programs or projects, whether there were any costs associated with the decision to cancel and, if so, a description of the amount of the costs (including for both the Administration and the private sector); (N) the metrics, milestones, and deadlines set for the program or project and how the Administration tracked and ensured compliance with those metrics, milestones, and deadlines; (O) how the Administration conducted oversight of the program or project and any related stakeholder collaboration efforts; and (P) the status of the program or project as of the date of the report; (9) the date upon which, or milestone by which, the Administration anticipates NextGen will be complete; and (10) any lessons learned during the NextGen effort, and whether, how, and to what effect those lessons have been applied. (b) Inspector general report Not later than 270 days after the date on which the report required under subsection (a) is submitted, the inspector general of the Department of Transportation shall review the report and submit to the Committee on Transportation and Infrastructure of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate a statement of the inspector general that— (1) determines the accuracy of the information reported; (2) describes any concerns with the accuracy of the information reported