Audit Plan non-mandatory

The mandatory document for ISO 9001:2015 is the audit programme. According to the standard the company must plan, establish, implement and maintain an audit programme that includes the frequency, methods,responsibilities, planning requirements and reporting. The audit plan is the schedule of the audit which is conducted in one or more days.

For more information about the audit programme, you can see the following materials: 

- What is the ISO 9001 audit program and how does it work: https://advisera.com/9001academy/blog/2017/01/24/what-is-the-iso-9001-audit-program-and-how-does-it-work/

- Free online training - ISO 9001:2015 Foundations Course: https://training.advisera.com/course/iso-9001-foundations-course/

- Book - Discover ISO 9001:2015 through practical examples:  https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/