Update assignment_and_exam.md

wyhitcs · Apr 11, 2016 · 7ceed5d · 7ceed5d
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@@ -373,14 +373,22 @@ Homework
 
 ![](2014-EX1-6-1.png)
 ![](2014-EX1-6-2.png)
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 2013-AS2-3-EPAL
 
 ![](2013-AS2-3.png)
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 2013-EX1-6-EPAL
 
+* Explain the notion of policy refinement in Enterprise Privacy Authorization Language (EPAL). Describe the scope-based policy comparison algorithm for policy refinement.
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 2012-AS2-3-EPAL
+![](2012-AS2-3.png)
 
 2012-EX2-4-EPAL
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+* Describe the EPAL policy model.
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 ## eXtensible Access Control Markup Language(XACML) 1
 
 ## eXtensible Access Control Markup Language(XACML) 2