Professional audit Currently, it is necessary and very important to all businesses. The companies listed on the Stock Exchange of Thailand. The SEC. Has a requirement for companies listed on the SET. Must provide the Company's internal audit unit. The establishment of a specialized agency that is independent and unbiased. An important role in evaluating the performance of the organization in accordance with the procedures prescribed. This will be an important tool To help administrators monitor the performance of each department in the organization. In addition, the auditors also a consultant for the company to plan the operation to occur. If the Company has operations. And has been monitored regularly, it is a way to prevent errors that may occur.