Billing and cash
Time and materials work without the argument
Time and materials work stays out of arguments when rates, a not-to-exceed cap, a signed daily ticket and a weekly bill are agreed before the crew starts.
Tagged
Time and materials.
Every article tagged time and materials.
Try it on one of your own jobs.
Draw a lot you priced last month, price it with your own numbers, and see what it would have made. Free for 14 days, no credit card.