title: Application Architecture - Uncle Bob
body: <p>One week ago I've watched Robert C. Martin presentation about architecture:
  <a href="http://www.youtube.com/watch?v=WpkDN78P884" rel="nofollow">http://www.youtube.com/watch?v=WpkDN78P884</a></p>
  
  <p>I don't understand the chart which you could see at 0:24:46. I was trying to implement it, but some how I can't. Why there are 2 boundries? Why Delivery mech. implements Boundry? Im confused, could anyone explain it to me? </p>
  
  <p>Best regards</p>
  
  <hr>
  
  <p>EDIT:
  ok, I've found the answer</p>