So one of the requirements in our Fortune 500 proposal, is a detailed
plan for change management. I'm guessing that the client will be
wanting to sign off each and every modification or update.

Working with Agile and Rails, change management isn't something we
normally consider too carefully during initial development - features
are scheduled into iterations and the client is always aware of what
is in which iteration. And if they want to change their mind, that's
just fine - we shuffle things around. So would I simply have a form
that signed off for any changes to the content of an iteration? Does
anyone have an example of such a form?

thx
Nick