title: Deferred Validation
body: <blockquote>
    <p>The Whole Values (1) that quantify a domain model have been checked to
    ensure that they are recognizable values, may have been further edited
    for suitability by the domain model and have been Echoed Back (4) to
    the user. All of these checks are immediate on entry. There is,
    however, a class of checking that should be deferred until the last
    possible moment.</p>
  </blockquote>
  
  <p>In <a href="http://c2.com/ppr/checks.html" rel="nofollow"><em>The CHECKS Pattern Language of Information Integrity</em></a> Ward Cunningham addresses <a href="http://c2.com/ppr/checks.html#6" rel="nofollow">Deferred Validations (6)</a> for whole objects. But this is still not fully clear to me :( </p>
  
  <p>I understand deferred validation is a very detailed validation for a complex object. So, should I use this validation in a test method or inside the domain property while following DDD? Is this can be implemented for UI?</p>
  
  <p>And also when should I avoid this? What are the cons of Deferred validation? Can anyone please explain this with an example? Thanks in advance</p>