How do you optimize your SoW to avoid scope creep?

[Btaliat]

Among many reasons why freelancers always prepare their SoW effectively in freelancing is that they won't have any reason to have scope creep. Not all clients always understand some unforseen circumstances that can cause scope creep. Do you always write your Statement of Work in such a way that will prevent any delay in you delivering your tasks? Share the way you do write it. Do it in the comment section for others to know more about it as well.