From my interview with Sebastien Auvray for InfoQ: Experiment Driven Development – The Post-Agile Way:
It’s not just having quantifiable return on business. If quantifiable returns have to trickle from marketing to dev managers down to team leaders, then you have a bandwidth and latency issue. It’s about putting developers directly on the front line, baking metrics into the process, and measuring key business goals.
I call that “post Agile” because it build on the great foundation of Agile, but displaces “working software as primary measure of progress” with “validated learning and key metrics”. EDD is to post-Agile what TDD is to Agile.