The use of internal control as a tool to assist internal auditing in organisations can be limited to the control of strict legal duties, but above all must be guided by the correct use of resource management in order to achieve the goals and objectives set by management, especially in the fulfilment of its mission. An adequate internal control system minimises the risks of the audit and consequently the extent of the procedures to be adopted by the auditor, since audit work is becoming an increasingly important issue for the company which, either by legal obligation or internally, has to certify that the financial information it produces is correct, appropriate and reliable.