title: Scrum : Different Product owner and Project Manager
body: <p>I have created a short document of two authors : Ken Swchaber and Jeff Sutherland. At definition in this document about Product Owner:</p>
  
  <blockquote>
    <p>The Product Owner is the sole person responsible for managing the
    Product Backlog</p>
  </blockquote>
  
  <p>I see that <code>Product owner</code> is very like to <code>Project  Manager</code> in normal software development process. </p>
  
  <p>So, what does a real difference, or just the same.  </p>