I always lay out scope up front. Document it, and base your cost on that scope.
Then, when a client requests a change, or anything that's not scoped, it's easy to point to your scope document and say "sure - we can do that. It'll take 3 days to implement, and will cost you $xxx.00 - wanna do it?"
Plus, having a change order makes it easy to know what was changed or added a year from now when they want upgrades, etc..
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