diff --git a/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/Alias.java b/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/Alias.java
new file mode 100644
index 0000000..dac8427
--- /dev/null
+++ b/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/Alias.java
@@ -0,0 +1,72 @@
+package org.ntlab.deltaExtractor;
+import org.ntlab.trace.MethodExecution;
+import org.ntlab.trace.Statement;
+import org.ntlab.trace.TracePoint;
+/**
+ * �I�u�W�F�N�g�̎Q�Ə��(�G�C���A�X)��\���N���X
+ * @author Isitani
+ *
+ */
+public class Alias {
+	private String objectId;
+	private TracePoint occurrencePoint; // ���Y�I�u�W�F�N�g�̎Q�Ƃ��s���Ă�����s�ӏ��ɑΉ�����TracePoint
+	private AliasType aliasType;
+	private int index;
+	
+	public enum AliasType {
+		// ���\�b�h�ւ̓���
+		FORMAL_PARAMETER, 
+		THIS, 
+		METHOD_INVOCATION, 
+		CONSTRACTOR_INVOCATION, 
+		
+		// �ǐՃI�u�W�F�N�g�̐؂�ւ�
+		FIELD, 
+		CONTAINER, 
+		ARRAY_ELEMENT, 
+		ARRAY, 
+		ARRAY_CREATE, 
+
+		// ���\�b�h����̏o��
+		ACTUAL_ARGUMENT, 
+		RECEIVER, 
+		RETURN_VALUE
+	}
+	
+	public Alias(AliasType aliasType, int index, String objectId, TracePoint occurrencePoint) {
+		this.aliasType = aliasType;
+		this.index = index;
+		this.objectId = objectId;
+		this.occurrencePoint = occurrencePoint;
+	}
+	
+	public AliasType getAliasType() {
+		return aliasType;
+	}
+	
+	public int getIndex() {
+		return index;
+	}
+	
+	public String getObjectId() {
+		return objectId;
+	}
+	
+	public TracePoint getOccurrencePoint() {
+		return occurrencePoint;
+	}
+	
+	public MethodExecution getMethodExecution() {
+		return occurrencePoint.getMethodExecution();
+	}
+	
+	public String getMethodSignature() {
+		return occurrencePoint.getMethodExecution().getCallerSideSignature();
+	}
+	
+	public int getLineNo() {
+		Statement statement = occurrencePoint.getStatement();
+		return statement.getLineNo();
+	}
+	
+}
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