Basic Yellow Book Auditor Training: Internal Control Evaluation and the Green Book Standards

Author: Robert K Minniti

This course provides foundational Yellow Book auditor training focused on evaluating internal control in government audits under the U.S. Government Accountability Office (GAO) Yellow Book, formally known as Generally Accepted Government Auditing Standards (GAGAS). A strong understanding of internal control is essential for government auditors, as internal control evaluation directly influences audit planning, risk assessment, compliance responsibilities, and reporting. This course introduces participants to the Standards for Internal Control in the Federal Government—commonly referred to as the GAO Green Book—and explains how the Green Book aligns with and supports GAGAS audit requirements.

Participants will learn how to obtain and document an understanding of internal control, evaluate control design and implementation, and determine the impact of internal controls on audit strategy. The course covers the five components and seventeen principles of internal control, the relationship between the Green Book and the COSO framework, and the identification and evaluation of control deficiencies. Through practical examples and scenario‑based discussions, attendees will gain the skills needed to assess internal controls effectively and communicate results in accordance with Yellow Book reporting standards.

Publication Date: June 2026

Designed For
This course is designed for professionals who need a solid foundation in evaluating internal control under the Yellow Book and Green Book standards.

Topics Covered

• Internal control requirements under the Yellow Book (GAGAS)
• Overview of the GAO Green Book framework for internal control
• The five components of internal control: control environment, risk assessment, control activities, information and communication, and monitoring
• Seventeen principles of internal control and related attributes
• Relationship between the GAO Green Book and the COSO Internal Control Framework
• Understanding and documenting internal control through walkthroughs and process mapping
• Identifying key controls and control objectives
• Evaluating design and implementation effectiveness of internal controls
• Testing controls and determining reliance in a GAGAS audit
• Identifying and evaluating control deficiencies
• Internal control considerations in compliance and Single Audits
• Documentation and reporting requirements for internal control deficiencies under GAGAS

Learning Objectives

• Describe the purpose and structure of the GAO Green Book and its relationship to internal control requirements under GAGAS
• Identify the five components and seventeen principles of internal control and their relevance to government audits
• Evaluate the design and implementation of internal controls within a government audit environment
• Recognize how to assess internal control deficiencies and determine their significance, including deficiencies, significant deficiencies, and material weaknesses
• Apply internal control evaluation results to audit planning, risk assessment, and reporting under GAGAS

Level
Basic

Instructional Method
Self-Study

NASBA Field of Study
Auditing (Governmental) (2 hours)

Program Prerequisites
None

Advance Preparation
None