Have you ever heard anyone say, "No matter what we try, nothing ever really changes?" I have. I've heard it enough that I had to wonder why. There are quite a few Magic Processes around that promise to solve all the problems of organizations that depend on software delivery to support their business. Proponents of each one are dead-certain their way is the only right way. All the others are wrong. It occurs to me that they are very much like the blind men who tried to describe an elephant. Their perception of just what problems organizations are facing and just how to address those problems are rather narrowly limited.
There may be a second factor, as well: Any business enterprise or government agency is an organization of human beings. Process improvement frameworks and other types of Magic Bullets tend to treat human beings as if they were interchangeable machine parts. What if human organizations turn out to be somewhat more complex, and complex in different ways, than complicated mechanisms? Maybe we need an approach to organizational change that takes that into consideration.