When I was a kid, I remember we topped over this hill on I-15. Way down there in the distance, there was an overpass across the road. I remember wondering how my dad could aim the car accurately enough to go under that overpass from that far away. As an adult, I know that he didn't even try to do that. Instead, he steered the car as a continual process, not just once.
That's the same kind of problem with waterfall. You want them to do the analysis perfectly, and then you want the world to not move while the implementation happens. Neither of those is possible. And then you blame the analysts for failing to do the impossible.
The analysis phase is never complete enough. The conditions are never the same by the time the implementation is complete. That's just reality. What are you going to do about it? You need to steer during implementation, not just once at the beginning.
That's the same kind of problem with waterfall. You want them to do the analysis perfectly, and then you want the world to not move while the implementation happens. Neither of those is possible. And then you blame the analysts for failing to do the impossible.
The analysis phase is never complete enough. The conditions are never the same by the time the implementation is complete. That's just reality. What are you going to do about it? You need to steer during implementation, not just once at the beginning.