We use our version of SCRUM with pretty good results for our maintenance and small features. For large projects though, we wind up with a bit of BDUF just to g

We use our version of SCRUM with pretty good results for our maintenance and small features. For large projects though, we wind up with a bit of BDUF just to get a grip on what we're building. That ultimately morphes into our agile process as we get closer to the release. It's certainly not the "right" way to do it, but it works very well for us. Shops that are 100% full-on SCRUM seem to me to be mired in process, which is ironic.