There is no evidence that Scrum is better than informal SDLC. If it was possible[1] to scientifically compare them, my guess is that Scrum will be net negative.

There is no evidence that Scrum is better than informal SDLC. If it was possible[1] to scientifically compare them, my guess is that Scrum will be net negative. -- [1] unfortunately it's either impossible, or very expensive. I've seen cases at large companies when the same project was handled to two different teams as a competition, but in that case they used different technologies, not different SDLC methodologies.