This document provides an overview of the history and evolution of internal auditing. It discusses how internal auditing began in the 1940s when companies appointed internal auditors to review operations and report to management due to difficulties maintaining control during World War II. It then evolved from voluntary audits to becoming mandatory with increased regulations. The document outlines the historical periods of auditing development and discusses how the industrial revolution and growth of corporations led to a need for more formal accounting practices and professional standards to protect investors.