diff --git a/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.cpp b/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.cpp
index ad714a5f42..35a91ed396 100644
--- a/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.cpp
+++ b/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.cpp
@@ -1,59 +1,65 @@
 /*=========================================================================
 
 Program:   Medical Imaging & Interaction Toolkit
 Language:  C++
 Date:      $Date$
 Version:   $Revision: 16011 $
 
 Copyright (c) German Cancer Research Center, Division of Medical and
 Biological Informatics. All rights reserved.
 See MITKCopyright.txt or http://www.mitk.org/copyright.html for details.
 
 This software is distributed WITHOUT ANY WARRANTY; without even
 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.  See the above copyright notices for more information.
 
 =========================================================================*/
 
 #include "mitkNavigationDataEvaluationFilter.h"
 
 
 mitk::NavigationDataEvaluationFilter::NavigationDataEvaluationFilter()
 : mitk::NavigationDataToNavigationDataFilter()
 {
 
 }
 
 
 mitk::NavigationDataEvaluationFilter::~NavigationDataEvaluationFilter()
 {
 
 }
 
 void mitk::NavigationDataEvaluationFilter::GenerateData()
 {
 
     this->CreateOutputsForAllInputs(); // make sure that we have the same number of outputs as inputs
 
     /* update outputs with tracking data from tools */
     for (unsigned int i = 0; i < this->GetNumberOfOutputs() ; ++i)
     {
       mitk::NavigationData* output = this->GetOutput(i);
       assert(output);
       const mitk::NavigationData* input = this->GetInput(i);
       assert(input);
 
       if (input->IsDataValid() == false)
       {
         output->SetDataValid(false);
         continue;
       }
 
-     
+      
 
-     // output->SetOrientation(quatOut);
+      output->Graft(input);
 
 
     }
-  }
+  
+}
+
+void mitk::NavigationDataEvaluationFilter::ResetStatistic()
+{
+m_SumPositions.Fill(0);
+m_NumberAnalysedNavigationDatas = 0;
 }
diff --git a/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.h b/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.h
index 2979a5ed52..e4fe27fa03 100644
--- a/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.h
+++ b/Modules/IGT/IGTFilters/mitkNavigationDataEvaluationFilter.h
@@ -1,60 +1,69 @@
 /*=========================================================================
 
 Program:   Medical Imaging & Interaction Toolkit
 Language:  C++
 Date:      $Date$
 Version:   $Revision: 16011 $
 
 Copyright (c) German Cancer Research Center, Division of Medical and
 Biological Informatics. All rights reserved.
 See MITKCopyright.txt or http://www.mitk.org/copyright.html for details.
 
 This software is distributed WITHOUT ANY WARRANTY; without even
 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.  See the above copyright notices for more information.
 
 =========================================================================*/
 
 
 #ifndef MITKNavigationDataEvaluationFilter_H_HEADER_INCLUDED_
 #define MITKNavigationDataEvaluationFilter_H_HEADER_INCLUDED_
 
 #include <mitkNavigationDataToNavigationDataFilter.h>
 
 #include <itkQuaternionRigidTransform.h>
 #include <itkTransform.h>
 
 
 namespace mitk {
 
   /**Documentation
   * \brief NavigationDataEvaluationFilter calculates statistical data (mean value, mean error, etc.) on the input navigation data.
   * Input navigation data are set 1:1 on output navigation data.
   *
   * \ingroup IGT
   */
   class MitkIGT_EXPORT NavigationDataEvaluationFilter : public NavigationDataToNavigationDataFilter
   {
 
   public:
 
     mitkClassMacro(NavigationDataEvaluationFilter, NavigationDataToNavigationDataFilter);
     itkNewMacro(Self);
 
+    /** @brief Resets all statistics and starts again. */
+    void ResetStatistic();
+
+    /** @brief Resets the number of analysed navigation datas. */
+    itkGetMacro(NumberAnalysedNavigationDatas,int);
+
   
   protected:
 
     NavigationDataEvaluationFilter();
     virtual ~NavigationDataEvaluationFilter();
 
     /**Documentation
     * \brief filter execute method
     *
     * transforms navigation data
     */
     virtual void GenerateData();
 
+    mitk::Point3D m_SumPositions; //todo: make a map here, to have one sum for every navigation data
+    int m_NumberAnalysedNavigationDatas;
+
   };
 } // namespace mitk
 
 #endif /* MITKNavigationDataEvaluationFilter_H_HEADER_INCLUDED_ */
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