One of the things I do as director is make pixel perfect mockups which can be clicked through. In a day's time, I can have two months of project work presentable. Work doesn't start until what we are building is locked in, and when it's locked in it doesn't budge without a change order. An added benefit of the mock ups would be that these types of change orders have become rare since I took over.
If we're doing T&M, it's pretty agile. If it's fixed bid - which is often - we are bidding on a release's worth of work and working them through. If we were to go full agile on fixed bid projects we would lose our shirts with a lot of indecisive clients. We also don't charge project overages on our fixed bid and guarantee our work.
