"signing off" on parts of project

My company doesn't get the client's "okay" at numerous levels of the design 
and development cycle.  I haven't been with them very long, so I'm already 
anxious to see this change.

What's the actual process you take your clients through when signing off on 
parts of a project?  Do you make them initial some paperwork or do you just 
send them an email that documents what was verbally agreed upon?  If you use 
various methods, tell me when & why you use them.

++Dan

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