--- a/model/working-copy/towards-wd4.html	Wed Feb 08 11:20:23 2012 +0000
+++ b/model/working-copy/towards-wd4.html	Wed Feb 08 12:03:13 2012 +0000
@@ -1494,10 +1494,26 @@
 
 </div>
 
+</section>
+
+
+<section id="record-OrderingOfActivities">
+<h3>Activity Ordering</h3>
+
+
+The following two relations are used to express dependencies amongst activities.
+
+<ul>
+  <li> An <dfn id="InformationFlowOrdering">information flow ordering relation</dfn> states that activity  <span class="name">a2</span> is dependent on another <span class="name">a1</span>, by way of some entity <span class="name">e</span> that is generated by <span class="name">a1</span> and used by <span class="name">a2</span>.
+    <li>A <dfn id="ControlOrdering">control ordering record</dfn> states that  activity <span class="name">a2</span> was initiated by another activity <span class="name">a1</span>.
+</ul>
+
+
+
+
 
 </section>
 
-
     <section id="extensibility-section"> 
 <h2>PROV-DM Extensibility Points</h2>