Our IA checklist (we are an SQF Food Safety and Quality Certified paperboard packaging manufacturer) breaks the areas of audit into section: GMPs, Waste Removal, Facility, Storage / Shipping, Equipment, Traceability and Product ID, Pest Control and Maintenance. Each of those sections has a letter designation (A - H) and each item in each section is numbered for reference. For example, if there is an issue with rat lines somewhere in the audited area, it would reference a suggested corrective action for C,4 in the CA notes area of the form at the end. So the first column is the number of the line item, the next column is the item to be checked ( Ex: #4 - Rat lines are clear and accessible), the next is a "PASS" column, then a "FAIL" column, a N/A column then a comments section after the areas to be audited. There is a review and date line for the SQF Practitioner when they receive and review it and then a revision table at the end of the document. We have used a form of this for 6 years and has been reviewed and accepted by the auditor every time.