--- a/model/ProvenanceModel.html	Wed Sep 07 16:34:18 2011 +0100
+++ b/model/ProvenanceModel.html	Wed Sep 07 16:43:37 2011 +0100
@@ -228,6 +228,21 @@
 
 </section>
 
+    <section> 
+<h2>A PIDM Overview </h2>
+
+<div class='note'>
+<p>It is proposed to write a short overview of the model, so that the reader can get a feel for what the model does. </p>
+<p>A notion of graph</p>
+<p>Typed nodes, entities, process execution, agents, which are respectively representions of characterized things, activities, and characterized things capable of activies. Show their graphical represenation.</p>
+<p>Typed edges: use, generation, derivation, peOrder, participation, complementarity. Show their graphical representations.</p>
+<p>The ability to delimit subgraph, as representations of the world asserted by asserters, by a notion of account.
+<p>
+</div>
+
+    </section> 
+
+
     <section class="informative"> 
 <h2>Example</h2>