By subject
- Financial
- Information
- Exactness, Validation
- Compliance
- Performance
- Goal reaching
- Economic efficiency
- System audit
- Product audit
- Process audit
- Project audit
- Quality audit
- Environmental
- etc.
By Auditor
- Internal audit (1st Party)
- Supplier audit (2nd Party)
- Certification audit (3rd Party)
Others
- Audit in relation to the certification of management systems
- Pre-audit to determine the possibility of certification (a so-called “friendly audit”)
- Survey audit