The success of Scrum is almost completely dependent on the various members of the Scrum framework, and their understanding and emulation of the respective duties in whatever designation they are occupying.
Let us consider exactly what the role of the scrum master, product owner, and development team is, respectively.
The Product Owner is in some ways the representative of the customer. The basic role here is to ensure that the business output produced meets the requirements of the client. You can read more about the role of SAFe 5.1 product owner/product manager through online websites.
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For this to be accomplished, the product owner writes customer-centric items, arranges them in order of priority, and then adds them to the product backlog for the development team to work upon.
The lattermost of these – writing the product backlog – is amongst the most important of all Scrum processes, and should thus be done with utmost intelligence and care to detail. Thus, the product owner should be someone of great skill and experience in that regard.
The Scrum Master is the servant-leader in a scrum. This implies that his leadership is limited within the purview of ensuring that the Development team does not face any obstacles in the course of their work.
He also establishes the channel of communication between the product owner and the team, alongside being responsible for crisis management, if and when the need arises.
Finally, the development team is the backbone of the actual product development process. It is responsible for producing potentially shippable product parts at the end of each sprint.
The team members have cross-functional skills and plan, design, develop, test, analyze, and so on, all themselves, with each team member bringing their own expertise to the forefront.