diff --git a/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java b/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
index ed4bc60..41031d0 100644
--- a/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
+++ b/src/org/ntlab/deltaViewer/CollaborationObjectCallGraph.java
@@ -122,4 +122,8 @@
 		}).collect(Collectors.toList());
 		return sortedTpList;
 	}
+	
+	public void shrinkAll() {
+		// TODO Implement shrinkAll().
+	}
 }
diff --git a/src/org/ntlab/deltaViewer/DeltaAliasCollector.java b/src/org/ntlab/deltaViewer/DeltaAliasCollector.java
index ebad72e..cd25b31 100644
--- a/src/org/ntlab/deltaViewer/DeltaAliasCollector.java
+++ b/src/org/ntlab/deltaViewer/DeltaAliasCollector.java
@@ -4,9 +4,11 @@
 import java.util.List;
 
 import org.ntlab.deltaExtractor.Alias;
+import org.ntlab.deltaExtractor.Alias.AliasType;
 import org.ntlab.deltaExtractor.IAliasTracker;
 import org.ntlab.trace.MethodExecution;
 import org.ntlab.trace.MethodInvocation;
+import org.ntlab.trace.Statement;
 
 /**
  * Collect delta alias for MagnetRON.(Derived from DeltaAliasTracker.)
@@ -75,4 +77,50 @@
 		
 	}
 
+	public void shrink() {
+		// TODO Implement shrink().
+		List<Alias> standardMethodInvocations = collectStandardMethodInvocations(aliasList);
+		List<List<Alias>> invocatoinChains = collectInvocatoinChains(standardMethodInvocations);
+		replaceInvocatoinChains(aliasList, invocatoinChains);
+	}
+	
+	private List<Alias> collectStandardMethodInvocations(List<Alias> aliasList) {
+		// TODO Implement collectStandardMethodInvocations().
+		for (int i = 0; i < aliasList.size(); i++) {
+			Alias alias = aliasList.get(i);
+			if (alias.getAliasType() == AliasType.RECEIVER) {
+				Statement st = alias.getOccurrencePoint().getStatement();
+				MethodInvocation methodInvocation = (MethodInvocation)st;
+				if (methodInvocation.getCalledMethodExecution().isCollectionType()) {
+					
+				}
+			} else if (alias.getAliasType() == AliasType.THIS) {
+				if (alias.getMethodExecution().isCollectionType()) {	
+				}
+			} else if (alias.getAliasType() == AliasType.RETURN_VALUE) {
+				if (alias.getMethodExecution().isCollectionType()) {
+				}
+			} else if (alias.getAliasType() == AliasType.METHOD_INVOCATION) {
+				Statement st = alias.getOccurrencePoint().getStatement();
+				MethodInvocation methodInvocation = (MethodInvocation)st;
+				if (methodInvocation.getCalledMethodExecution().isCollectionType()) {
+				}				
+			}
+		}
+		return null;
+		
+	}
+	
+	private List<List<Alias>> collectInvocatoinChains(List<Alias> standardMethodInvocations) {
+		// TODO Implement collectInvocatoinChains().		
+		return null;
+		
+	}
+	
+	private List<Alias> replaceInvocatoinChains(List<Alias> aliasList, List<List<Alias>> invocatoinChains) {
+		// TODO Implement replaceInvocatoinChains().		
+		return null;
+	}
+	
+	
 }