Scrum Voids Product Manager

Question:"Scrum defines only three roles: product owner, scrum master, and team. Therefore we do not need a product manager."

Answer: According to the Blackblot PMTK Methodology™, product management is a strategic function in the problem space.

Scrum only pertains to managing a software development project in the solution space.

Accordingly, Scrum cannot bring any claim or pretension to anything outside the development project.