1. Inquiry of management regarding procedures undertaken to identify PP&E impairment. 
2. Obtain related documents used by the management to conclude the appropriateness of assumptions. 
3. Check evidence of review and approval. 
4. Review and challenge model and assumptions used by the Company. 
- Determine the reasonableness of assumptions by ascertaining whether they are in line with trends and our expectations 
- Test accuracy of underlying data 
- Test recalculation (if applicable) 
5. Obtain specific letter of representation