title: ASPs from Testing Architecture
body: <p>I need to know what is the purpose of the (N-1)-ASPs/PCO between the lower tester (LT) and the lower level service provider in this example :</p>
  
  <p><a href="https://i.stack.imgur.com/lKHC4.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lKHC4.jpg" alt="enter image description here"></a></p>
  
  <p>Someone can help me to understand ?</p>