diff --git a/src/seedu/addressbook/commands/ExitCommand.java b/src/seedu/addressbook/commands/ExitCommand.java
index 2f280395c..0ec095d0c 100644
--- a/src/seedu/addressbook/commands/ExitCommand.java
+++ b/src/seedu/addressbook/commands/ExitCommand.java
@@ -13,6 +13,8 @@ public class ExitCommand extends Command {
 
     @Override
     public CommandResult execute() {
+    	addressBook.printTaggings();
+    	addressBook.clearTaggings();
         return new CommandResult(MESSAGE_EXIT_ACKNOWEDGEMENT);
     }
 
diff --git a/src/seedu/addressbook/data/AddressBook.java b/src/seedu/addressbook/data/AddressBook.java
index 6a37d752d..0b4e3927f 100644
--- a/src/seedu/addressbook/data/AddressBook.java
+++ b/src/seedu/addressbook/data/AddressBook.java
@@ -4,7 +4,10 @@
 import seedu.addressbook.data.person.UniquePersonList.*;
 import seedu.addressbook.data.tag.UniqueTagList;
 import seedu.addressbook.data.tag.UniqueTagList.*;
+import seedu.addressbook.data.tag.Tagging;
+import seedu.addressbook.data.tag.Tagging.TaggingType;
 import seedu.addressbook.data.tag.Tag;
+import java.util.ArrayList;
 
 import java.util.HashMap;
 import java.util.HashSet;
@@ -22,13 +25,14 @@ public class AddressBook {
 
     private final UniquePersonList allPersons;
     private final UniqueTagList allTags; // can contain tags not attached to any person
-
+    private static ArrayList<Tagging> allTaggings;
     /**
      * Creates an empty address book.
      */
     public AddressBook() {
         allPersons = new UniquePersonList();
         allTags = new UniqueTagList();
+        allTaggings = new ArrayList<Tagging>();
     }
 
     /**
@@ -89,6 +93,17 @@ public void addPerson(Person toAdd) throws DuplicatePersonException {
     public void addTag(Tag toAdd) throws DuplicateTagException {
         allTags.add(toAdd);
     }
+    
+    /**
+     * Adds a tagging to the list of taggings present in the address book
+     * @param person
+     * @param tag
+     * @param taggingType
+     */
+    public void addTagging(Person person, Tag tag, TaggingType taggingType){
+    	Tagging toAdd = new Tagging(person, tag, taggingType);
+    	allTaggings.add(toAdd);
+    }
 
     /**
      * Checks if an equivalent person exists in the address book.
@@ -123,13 +138,29 @@ public void removeTag(Tag toRemove) throws TagNotFoundException {
     }
 
     /**
-     * Clears all persons and tags from the address book.
+     * Clears all persons, tags and taggings from the address book.
      */
     public void clear() {
         allPersons.clear();
         allTags.clear();
+        allTaggings.clear();
     }
-
+	/**
+	 * Print the list of taggings 
+	 */
+    public void printTaggings(){
+    	for(Tagging tagging: allTaggings){
+    		System.out.println(tagging.toString());
+    	}
+    }
+    
+    /**
+     * Clear the list of taggings
+     */
+    public void clearTaggings(){
+    	allTaggings.clear();
+    }
+    
     /**
      * Defensively copied UniquePersonList of all persons in the address book at the time of the call.
      */
diff --git a/src/seedu/addressbook/data/tag/Tagging.java b/src/seedu/addressbook/data/tag/Tagging.java
new file mode 100644
index 000000000..3da020081
--- /dev/null
+++ b/src/seedu/addressbook/data/tag/Tagging.java
@@ -0,0 +1,59 @@
+package seedu.addressbook.data.tag;
+import seedu.addressbook.data.person.Person;
+import java.util.ArrayList;
+/**
+ * Association Class 
+ * represent an adding or deleting of a tag 
+ * for a specific person that happened during a specific session
+ * @author LiChengcheng
+ *
+ */
+public class Tagging {
+	public enum TaggingType {ADD, DELETE};
+	
+	private Person _person;
+	private Tag _tag;
+	private TaggingType _taggingType;
+	
+	public static final String ADD_TAGGING_EXPRESSION = "+";
+	public static final String DELETE_TAGGING_EXPRESSION = "-";
+
+	public Tagging(Person person, Tag tag, TaggingType taggingType){
+		_person = person;
+		_tag = tag;
+		_taggingType = taggingType;
+	}
+
+	/**
+	 * @return the _person
+	 */
+	public Person get_person() {
+		return _person;
+	}
+
+	/**
+	 * @return the _tag
+	 */
+	public Tag get_tag() {
+		return _tag;
+	}
+
+	/**
+	 * @return the _taggingType
+	 */
+	public TaggingType get_taggingType() {
+		return _taggingType;
+	}
+	
+	private String getTypeExpression(){
+		if(this.get_taggingType().equals(TaggingType.ADD)){
+			return ADD_TAGGING_EXPRESSION;
+		}
+		return DELETE_TAGGING_EXPRESSION;
+	}
+	
+	public String toString(){
+		return this.getTypeExpression()+ " " + this.get_person().getName() + " " 
+				+ this.get_tag();
+	}
+}