Click the image below for the Scrum Method Valued Model in pdf
Click below to find out why the PO role is crucial (NOT TO MANAGE OR RIDE THE SCRUM TEAM) but rather to define User Stories (WHAT WHEN) and approve the demo deck after each sprint
Scrum method is under control, following scrum process in a stepwise manner; delivering results!
FYI, if you do not know this already: the Scrum Master is in the saddle!
The Product Owner's job is to manage the race track!
Here is the concept in more detail