Module 4 covers the new OMB regulations in 2 CFR Part 200 and how the new regulations affect Pub. L. 93-638 agreements. It identifies the new requirements under 2 CFR Part 200 as it relates to cost principles, single audits, and steps to address non-compliance issues including imposing sanctions on tribes. It provides guidance on the responsibilities of tribes, auditors, and federal agencies on pre-audit, during audits, and post-audits.