Nationwide Insurance had a "Scrummerfall" approach, with long, linear, upfront planning cycles that eventually fed work to agile delivery teams, only to then have the completed work languish in further waterfall steps toward deployment. 

Most agile practitioners first learn by reading a book, taking a class, or attending local meetings. But learning concepts works best when we can put some concrete examples and practice behind the theory. 

While the Scrum product owner is arguably the most crucial role within agile teams, we often hear horror stories about POs who aren’t available to their teams, change their minds incessantly on business priorities, or ignore quality requirements and technical debt.

Organizational diversity isn't just about the attributes we can see. Every team has members with a near-infinite spectrum of needs, some of which we know about and a lot more we probably don't (and might never).