diff --git a/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java b/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java
index a192105..2f896fe 100644
--- a/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java
+++ b/org.ntlab.traceAnalyzer/src/org/ntlab/deltaExtractor/DeltaExtractor.java
@@ -12,24 +12,31 @@
 import org.ntlab.trace.Trace;
 import org.ntlab.trace.TracePoint;
 
+/**
+ * �f���^���o�A���S���Y��(�z��ւ̃A�N�Z�X�𐄑�����]���̃o�[�W����)
+ *    extract(...)���\�b�h�Q�Œ��o����B
+ * 
+ * @author Nitta
+ *
+ */
 public class DeltaExtractor {
-	private static final int LOST_DECISION_EXTENSION = 0;		// ��{�� 0 �ɐݒ�Bfinal�ϐ��̒ǐՃA���S���Y���̕s��C����͕s�v�̂͂��B
-	private ArrayList<String> data = new ArrayList<String>();
-	private ArrayList<String> objList = new ArrayList<String>(2);
-	private ArrayList<String> methodList = new ArrayList<String>();
-	private ExtractedStructure eStructure = new ExtractedStructure();
-	private ObjectReference srcObject = null;
-	private ObjectReference dstObject = null;
-	private String returnValue;
-	private String threadNo;
-	private boolean isLost = false;
-	private ArrayList<String> checkList = new ArrayList<String>();
-	private Trace trace = null;
-	private int finalCount = 0;			// final�ϐ������o�ł��Ȃ��”\��������̂ŁA�R���̉������ł��Ȃ������ꍇ�ł����΂炭�ǐՂ��‚Â���
+	protected static final int LOST_DECISION_EXTENSION = 0;		// ��{�� 0 �ɐݒ�Bfinal�ϐ��̒ǐՃA���S���Y���̕s��C����͕s�v�̂͂��B
+	protected ArrayList<String> data = new ArrayList<String>();
+	protected ArrayList<String> objList = new ArrayList<String>(2);
+	protected ArrayList<String> methodList = new ArrayList<String>();
+	protected ExtractedStructure eStructure = new ExtractedStructure();
+	protected ObjectReference srcObject = null;
+	protected ObjectReference dstObject = null;
+	protected String returnValue;
+	protected String threadNo;
+	protected boolean isLost = false;
+	protected ArrayList<String> checkList = new ArrayList<String>();
+	protected Trace trace = null;
+	protected int finalCount = 0;			// final�ϐ������o�ł��Ȃ��”\��������̂ŁA�R���̉������ł��Ȃ������ꍇ�ł����΂炭�ǐՂ��‚Â���
 	
-	private static final boolean DEBUG1 = true;
-	private static final boolean DEBUG2 = true;
-
+	protected static final boolean DEBUG1 = true;
+	protected static final boolean DEBUG2 = true;
+	
 	public DeltaExtractor(String traceFile) {
 		trace = new Trace(traceFile);
 	}
@@ -75,7 +82,7 @@
 	 * @return ���‚������R�[�f�B�l�[�^
 	 * @throws TraceFileException
 	 */
-	private MethodExecution callerSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, MethodExecution childMethodExecution) {
+	protected MethodExecution callerSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, MethodExecution childMethodExecution) {
 		MethodExecution methodExecution = tracePoint.getMethodExecution();
 		methodExecution.setAugmentation(new DeltaAugmentationInfo());
 		eStructure.createParent(methodExecution);
@@ -482,7 +489,7 @@
 	 * @param index�@objList���̂ǂ̃I�u�W�F�N�g��ǐՂ��Ă��̃��\�b�h���s�ɓ����Ă����̂�
 	 * @throws TraceFileException
 	 */
-	private void calleeSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, Boolean isStatic, int index) {
+	protected void calleeSearch(Trace trace, TracePoint tracePoint, ArrayList<String> objList, Boolean isStatic, int index) {
 		MethodExecution methodExecution = tracePoint.getMethodExecution();
 		Boolean isResolved = false;
 		String objectId = objList.get(index);		// calleeSearch() �ł͒ǐՑΏۂ̃I�u�W�F�N�g�͈�‚����A��objList��index�Ԗڂ̗v�f�ȊO�ύX���Ă͂����Ȃ�