I took a software engineering class as part of a certificate program at UCSD extention back in 1986. The text,
Software Engineering Concepts by Richard Fairley dwelled on Waterfall and Spiral development which has very close ties to Agile methods. So Agile methods are more battle-tested than most managers believe.
Nice presentation: click on Tutorial down the page:
http://courses.cs.vt.edu/csonline/SE/Lessons/Spiral/ http://www.cse.ogi.edu/~dfairley/