In short, fix cost projects require a lot of upfront documentation to provide a defined scope of work. Clients always work with you as long as you have the paper trail to prove what you guys talked about. I do it with a detailed scope of work.
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How do you do cost estimate for fixed price cost?
As customer always change and give detail requirement after your quote, too low estimate would lower your income.
In short, fix cost projects require a lot of upfront documentation to provide a defined scope of work. Clients always work with you as long as you have the paper trail to prove what you guys talked about. I do it with a detailed scope of work.