In the olden times there were scientists actually researching project management, measuring, changing inputs, performing experiments, probably at IBM or NASA.

In the olden times there were scientists actually researching project management, measuring, changing inputs, performing experiments, probably at IBM or NASA. We don’t do this anymore, because IT is now less costly, and sometimes doing the thing is faster than writing the plan for it. So Agile won. Probably deterministic methodologies got stuck in a local minimum, which was ridiculously expensive to run compared to Agile. I still have my book of IBM RUP process.