Thesis deals with the quality control of audit firms in accordance with international regulations. Defining the requirements for quality based on the Code of Ethics and the International quality standard ISQC1. Part of this work is the practical demonstration of ISQC1 in the smaller audit firm. For comparison, there is a description of quality control in the U.S.

The International Standards on Auditing are created and published by the International Auditing and Assurance Standards Board. These standards are high quality, modern and approved by regulators throughout the world. Most of the developed countries addopted the ISAs in some way. The International Standards on Auditing have been effective for all audits in the Czech Republic since 2005. Their implementation in the European Union is expected shortly. Standards contribute to better international comparability and enhance the credibility and quality of the audit, including auditor's report. The Clarity project was in progress between 2003 and 2009. It was aimed at clearing standards, increasing clarity and facilitating their interpretation.