Letting the client fix all three sides of the iron triangle is trouble no matter what your process, and squarely on your management. In practice, agile contrac

Letting the client fix all three sides of the iron triangle is trouble no matter what your process, and squarely on your management. In practice, agile contracts should be time+materials, or the vender needs to be a stakeholder in defining the scope. You almost always need a sketch of the total solution up front, and a light-weight change-management process. It's been years since I was in that business, but people have been working on this problem. You're not the first.