Many of my projects are billed in 3 phases ( 60/40/10). Prior to the release of payment, I request that my contractor provides a conditional on progress. After the first payment, should I be requesting a condition on progress waiver for the amount of the upcoming payment AND an unconditional on partial payment for any amount they have received to date? Is there a single document that effectively combines these? We work nationally so I have projects in all states, and most of my projects have 4-6 contractors and vendors.