diff --git a/TracerOnJavassist/src/tracer/ITraceGenerator.java b/TracerOnJavassist/src/tracer/ITraceGenerator.java
index 870078d..364d98c 100644
--- a/TracerOnJavassist/src/tracer/ITraceGenerator.java
+++ b/TracerOnJavassist/src/tracer/ITraceGenerator.java
@@ -1,5 +1,7 @@
 package tracer;
 
+import java.util.List;
+
 import javassist.CtBehavior;
 import javassist.CtClass;
 
@@ -11,23 +13,25 @@
 public interface ITraceGenerator {
 
 	public abstract String generateReplaceStatementsForFieldSet(
-			String targetClass, String targetObject, 
-			String argClass, String argObject, 
+			String fieldName, String containerClass, String containerObject, 
+			String valueClass, String valueObject, 
 			String threadId, String timeStamp);
 
-	public abstract String generateReplaceStatementsForFieldGet(String thisClass, String thisObject, 
-			String targetClass, String targetObject,
-			String returnedClass, String returnedObject, 
+	public abstract String generateReplaceStatementsForFieldGet(
+			String fieldName, String thisClass, String thisObject, 
+			String containerClass, String containerObject,
+			String valueClass, String valueObject, 
 			String threadId, String timeStamp);
 
 	public abstract String generateInsertBeforeStatements(
 			CtBehavior m, String methodSignature,
-			String thisClass, String thisObject, CtClass[] parameterClasses,
+			String thisClass, String thisObject, 
+			List<String> argClasses, List<String> argObjects,
 			String threadId, String timeStamp);
 
 	public abstract String generateInsertAfterStatements(
 			CtClass cls, CtBehavior m,
-			String thisObject, 
+			String thisClass, String thisObject, 
 			String returnedClass, String returnedObject,
 			String threadId, String timeStamp,
 			boolean isCallerSideInstrumentation);