title: what do contract-first and contract-last mean?
body: <p>I am doing some research on web services.  I have not written any web service but I am doing a small write up on them.</p>
  
  <p>During my research I've come across terms <strong>contract-first</strong> and <strong>contract-last</strong>.  </p>
  
  <p>Can someone explain these two in an understandable form ?  </p>