waterfall

Is frequency of release the only real difference between Agile and Waterfall?

Obviously the differences in the impact to teams, customers, ROI, etc. of applying the two approaches is huge and is the subject of many books and endless discussions and conferences. But as I think more about it, I am having a hard time finding any difference between the two that doesn't ultimately map to a single root difference which...

What percentage of software is developed/paid for by government?

In one of my software engineering classes we are discussing the waterfall model and why it does not work. My prof was arguing that the waterfall model was used so much since the US government required it for all software projects. Anyone have any idea what percentage of software development is paid for by the US government or governmen...