diff --git a/src/org/ntlab/traceDebugger/CallStackViewRelatedDelta.java b/src/org/ntlab/traceDebugger/CallStackViewRelatedDelta.java
index 9aa0b9f..c97c4ff 100644
--- a/src/org/ntlab/traceDebugger/CallStackViewRelatedDelta.java
+++ b/src/org/ntlab/traceDebugger/CallStackViewRelatedDelta.java
@@ -55,9 +55,7 @@
 					String calleeClassName = callee.getThisClassName();
 					String calleeId = callee.getThisObjId();
 					TracePoint before = callee.getCallerTracePoint();
-//					Variable variable = new Variable("tmp", callerClassName, callerId, calleeClassName, calleeId, before, false);
 					DeltaMarkerView newDeltaMarkerView = (DeltaMarkerView)TraceDebuggerPlugin.createNewView(DeltaMarkerView.ID, IWorkbenchPage.VIEW_ACTIVATE);
-//					newDeltaMarkerView.extractDelta(variable, false);
 					newDeltaMarkerView.extractDeltaForThisToAnother(callerId, callerClassName, calleeId, calleeClassName, before);
 				}
 			}
diff --git a/src/org/ntlab/traceDebugger/VariableViewRelatedDelta.java b/src/org/ntlab/traceDebugger/VariableViewRelatedDelta.java
index f9b9546..7067db3 100644
--- a/src/org/ntlab/traceDebugger/VariableViewRelatedDelta.java
+++ b/src/org/ntlab/traceDebugger/VariableViewRelatedDelta.java
@@ -92,7 +92,6 @@
 			@Override
 			public void run() {				
 				DeltaMarkerView newDeltaMarkerView = (DeltaMarkerView)TraceDebuggerPlugin.createNewView(DeltaMarkerView.ID, IWorkbenchPage.VIEW_ACTIVATE);
-//				newDeltaMarkerView.extractDelta(selectedVariable, true);
 				newDeltaMarkerView.extractDeltaForContainerToComponent(selectedVariable);
 			}
 		};
@@ -114,8 +113,7 @@
 					anotherId = selectedVariable.getValueId();
 					anotherClassName = selectedVariable.getValueClassName();
 				}
-				DeltaMarkerView newDeltaMarkerView = (DeltaMarkerView)TraceDebuggerPlugin.createNewView(DeltaMarkerView.ID, IWorkbenchPage.VIEW_ACTIVATE);				
-//				newDeltaMarkerView.extractDelta(selectedVariable, false);
+				DeltaMarkerView newDeltaMarkerView = (DeltaMarkerView)TraceDebuggerPlugin.createNewView(DeltaMarkerView.ID, IWorkbenchPage.VIEW_ACTIVATE);
 				newDeltaMarkerView.extractDeltaForThisToAnother(thisId, thisClassName, anotherId, anotherClassName, before);
 			}
 		};
@@ -175,7 +173,6 @@
 		String containerClassName = selectedVariable.getContainerClassName();
 		if (containerId != null  && containerClassName != null) {
 			containerClassName = containerClassName.substring(containerClassName.lastIndexOf(".") + 1);
-//			String textForContainerToComponent = String.format("Extract Delta (%s: %s �� %s: %s)", containerId, containerClassName, valueId, valueClassName);
 			String textForContainerToComponent = String.format("Extract Delta [ %s (id = %s) -> %s (id = %s) ]", containerClassName, containerId, valueClassName, valueId);
 			deltaActionForContainerToComponent.setText(textForContainerToComponent);
 			deltaActionForContainerToComponent.setToolTipText(textForContainerToComponent);
@@ -204,7 +201,6 @@
 		String thisClassName = before.getMethodExecution().getThisClassName();
 		if (thisId != null && thisClassName != null) {			
 			thisClassName = thisClassName.substring(thisClassName.lastIndexOf(".") + 1);			
-//			String textForThisToAnother = String.format("Extract Delta (%s: %s �� %s: %s)", thisId, thisClassName, anotherId, anotherClassName);
 			String textForThisToAnother = String.format("Extract Delta [ %s (id = %s) -> %s (id = %s) ]", thisClassName, thisId, anotherClassName, anotherId);
 			deltaActionForThisToAnother.setText(textForThisToAnother);
 			deltaActionForThisToAnother.setToolTipText(textForThisToAnother);
@@ -215,26 +211,6 @@
 			return false;
 		}
 	}
-	
-//	private boolean updateDeltaActionForThisToAnotherTexts(Variable variable) {
-//		String valueId = selectedVariable.getValueId();
-//		String valueClassName = selectedVariable.getValueClassName();
-//		valueClassName = valueClassName.substring(valueClassName.lastIndexOf(".") + 1);
-//		TracePoint before = selectedVariable.getBeforeTracePoint();
-//		String thisId = before.getMethodExecution().getThisObjId();
-//		String thisClassName = before.getMethodExecution().getThisClassName();
-//		if (thisId != null && thisClassName != null) {			
-//			thisClassName = thisClassName.substring(thisClassName.lastIndexOf(".") + 1);
-//			String textForThisToAnother = String.format("Extract Delta (%s: %s �� %s: %s)", thisId, thisClassName, valueId, valueClassName);
-//			deltaActionForThisToAnother.setText(textForThisToAnother);
-//			deltaActionForThisToAnother.setToolTipText(textForThisToAnother);
-//			return true;
-//		} else {
-//			deltaActionForThisToAnother.setText("");
-//			deltaActionForThisToAnother.setToolTipText("");
-//			return false;
-//		}
-//	}
 
 	public void markAndExpandVariablesByDeltaMarkers(Map<String, List<IMarker>> markers) {
 		List<IMarker> srcSideDeltaMarkers = markers.get(DeltaMarkerManager.SRC_SIDE_DELTA_MARKER);
diff --git a/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractionAnalyzer.java b/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractionAnalyzer.java
index 5c15180..1be49c6 100644
--- a/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractionAnalyzer.java
+++ b/src/org/ntlab/traceDebugger/analyzerProvider/DeltaExtractionAnalyzer.java
@@ -60,11 +60,6 @@
 	}
 
 	public DeltaMarkerManager extractDeltaForThisToAnother(String thisId, String thisClassName, String anotherId, String anotherClassName, TracePoint before) {
-//		TracePoint before = variable.getBeforeTracePoint();
-//		String srcId = before.getMethodExecution().getThisObjId();
-//		String srcClassName = before.getMethodExecution().getThisClassName();
-//		String dstId = variable.getValueId();
-//		String dstClassName = variable.getValueClassName();
 		MethodExecution me = before.getMethodExecution();
 		Map<ObjectReference, TracePoint> references = me.getObjectReferences(anotherClassName);
 		ObjectReference objectReference = null;
@@ -86,34 +81,6 @@
 		Reference reference = new Reference(thisId, anotherId, thisClassName, anotherClassName);
 		return new DeltaMarkerManager(coordinator, bottomPoint, reference, aliasCollector);
 	}
-	
-//	public DeltaMarkerManager extractDeltaForThisToAnother(Variable variable) {
-//		TracePoint before = variable.getBeforeTracePoint();
-//		String srcId = before.getMethodExecution().getThisObjId();
-//		String srcClassName = before.getMethodExecution().getThisClassName();
-//		String dstId = variable.getValueId();
-//		String dstClassName = variable.getValueClassName();
-//		MethodExecution me = before.getMethodExecution();
-//		Map<ObjectReference, TracePoint> references = me.getObjectReferences(dstClassName);
-//		ObjectReference objectReference = null;
-//		TracePoint tp = null;
-//		for (Map.Entry<ObjectReference, TracePoint> entry : references.entrySet()) {
-//			ObjectReference key = entry.getKey();
-//			if (key.getId().equals(dstId)) {
-//				objectReference = key;
-//				tp = entry.getValue();
-//				break;
-//			}
-//		}
-//		
-//		// �f���^���o
-//		TracePoint bottomPoint = tp.duplicate();
-//		DeltaRelatedAliasCollector aliasCollector = new DeltaRelatedAliasCollector(srcId, dstId);
-//		extractedStructure = deltaExtractor.extract(tp, objectReference, aliasCollector);
-//		MethodExecution coordinator = extractedStructure.getCoordinator();
-//		Reference reference = new Reference(srcId, dstId, srcClassName, dstClassName);
-//		return new DeltaMarkerManager(coordinator, bottomPoint, reference, aliasCollector);
-//	}
 
 	private TracePoint findTracePoint(Reference reference, MethodExecution methodExecution, long beforeTime) {
 		List<Statement> statements = methodExecution.getStatements();