ISMS audit

Answer: An ISO 27001:2005 certified lead auditor can perform internal audit if he/she can prove competence in 2013 revision of the standard. If not, then this person needs to take a training to obtain this competence.

This articles will provide you further explanation about new version of ISO 27001 and internal audit:
- Infographic: New ISO 27001 2013 revision – What has changed? https://advisera.com/27001academy/knowledgebase/infographic-new-iso-27001-2013-revision-what-has-changed/
- How to prepare for an ISO 27001 internal audit https://advisera.com/27001academy/blog/2016/07/11/how-to-prepare-for-an-iso-27001-internal-audit/

These materials will also help you regarding internal audit:
- ISO Internal Audit: A Plain English Guide https://advisera.com/books/iso-internal-audit-plain-english-guide/
- ISO 27001:2013 Internal Auditor Course https://advisera.com/training/iso-27001-internal-auditor-course/