ISO 14001 Performing Audits

You should study the audit criteria (standard and internal procedures) and develop a checklist. For example, in the following picture you have three lanes:

• Left – Reality
• Center – Doubts in your mind
• Right – Questions you can ask to clear the doubts 

You can look for more information below:

• How to make an ISO 14001 internal audit checklist - https://advisera.com/14001academy/blog/2016/06/27/how-to-make-an-iso-14001-internal-audit-checklist/
• Free webinar on demand - How to perform an ISO 14001:2015 internal audit - https://advisera.com/14001academy/webinar/how-to-perform-an-iso-14001-2015-internal-audit-free-webinar-on-demand/ (where I present another example of developing a checklist)
• Enroll for free in ISO 14001:2015 Internal Auditor Course - https://advisera.com/training/iso-14001-internal-auditor-course/
• Book - ISO internal audit: A plain English guide: https://advisera.com/books/iso-internal-audit-plain-english-guide/