Progress payments
 
 
	Normally, the supplier will submit regular progress invoices
- Make sure the contents of each invoice is consistent 
- With the commercial terms of the contract
-  Including "holdback" retention, if applicable
 
- Insist that the invoice displays 
- The total payments to date, and total contract value
 
- Make adjustments for currency exchange rate conversions, customs duties, etc
- And obtain the approval of the project's director/manager