Book excerpt: ISO 9001:2015 includes many changes that not only affect the companies aiming to achieve certification to it, but also auditors. This book is the resource auditors need to fully understand ISO 9001:2015 and help them perform audits to it. This book integrates two different types of audit strategies, conformance audits and performance audits, into one process approach audit. Conformance audits confirm that the organization is meeting the requirements of the standard, while performance audits confirm that the QMS is achieving its intended results. The book includes: An introduction to ISO 9001:2015 An auditing strategy for ISO 9001:2015 How to conduct a Stage 1 audit for ISO 9001:2015 How to conduct a Stage 2 on-site audit for ISO 9001:2015 Appendices include an introduction to process focus, an assessment report template for Stage 1 audits, a confidential assessment report template for Stage 2 audits, and an ISO 9001:2015 conformance checklist.