ISO 19011
ISO 19011 is an international standard that sets forth guidelines for management systems auditing. The current version is ISO 19011:2018.
It is developed by the International Organization for Standardization.
Originally it was published in 1990 as ISO 10011-1 and in 2002 took the current ISO 19011 numbering.
The standard offers four resources to organizations to "save time, effort and money":