diff --git a/apps/opencs/CMakeLists.txt b/apps/opencs/CMakeLists.txt
index ce83e4ea6..d2b87be51 100644
--- a/apps/opencs/CMakeLists.txt
+++ b/apps/opencs/CMakeLists.txt
@@ -7,7 +7,7 @@ set (OPENCS_SRC
     model/world/universalid.cpp model/world/idcollection.cpp model/world/data.cpp model/world/idtable.cpp
     model/world/commands.cpp model/world/idtableproxymodel.cpp model/world/record.cpp
 
-    model/tools/tools.cpp model/tools/verifier.cpp
+    model/tools/tools.cpp model/tools/operation.cpp model/tools/verifier.cpp
 
     view/doc/viewmanager.cpp view/doc/view.cpp view/doc/operations.cpp view/doc/operation.cpp
 
@@ -23,7 +23,7 @@ set (OPENCS_HDR
     model/world/idtable.hpp model/world/columns.hpp model/world/idtableproxymodel.hpp
     model/world/commands.hpp
 
-    model/tools/tools.hpp model/tools/verifier.hpp
+    model/tools/tools.hpp model/tools/operation.hpp model/tools/verifier.hpp
 
     view/doc/viewmanager.hpp view/doc/view.hpp view/doc/operations.hpp view/doc/operation.hpp
 
diff --git a/apps/opencs/model/tools/operation.cpp b/apps/opencs/model/tools/operation.cpp
new file mode 100644
index 000000000..ba5866168
--- /dev/null
+++ b/apps/opencs/model/tools/operation.cpp
@@ -0,0 +1,35 @@
+
+#include "operation.hpp"
+
+#include <QTimer>
+
+#include "../doc/state.hpp"
+
+CSMTools::Operation::Operation (int type) : mType (type) {}
+
+void CSMTools::Operation::run()
+{
+    mStep = 0;
+
+    QTimer timer;
+
+    timer.connect (&timer, SIGNAL (timeout()), this, SLOT (verify()));
+
+    timer.start (0);
+
+    exec();
+}
+
+void CSMTools::Operation::abort()
+{
+    exit();
+}
+
+void CSMTools::Operation::verify()
+{
+    ++mStep;
+    emit progress (mStep, 1000, mType);
+
+    if (mStep>=1000)
+        exit();
+}
\ No newline at end of file
diff --git a/apps/opencs/model/tools/operation.hpp b/apps/opencs/model/tools/operation.hpp
new file mode 100644
index 000000000..b75e2898f
--- /dev/null
+++ b/apps/opencs/model/tools/operation.hpp
@@ -0,0 +1,35 @@
+#ifndef CSM_TOOLS_OPERATION_H
+#define CSM_TOOLS_OPERATION_H
+
+#include <QThread>
+
+namespace CSMTools
+{
+    class Operation : public QThread
+    {
+            Q_OBJECT
+
+            int mType;
+            int mStep;
+
+        public:
+
+            Operation (int type);
+
+            virtual void run();
+
+        signals:
+
+            void progress (int current, int max, int type);
+
+        public slots:
+
+            void abort();
+
+        private slots:
+
+            void verify();
+    };
+}
+
+#endif
\ No newline at end of file
diff --git a/apps/opencs/model/tools/verifier.cpp b/apps/opencs/model/tools/verifier.cpp
index 14cb692e9..9c00d4ea7 100644
--- a/apps/opencs/model/tools/verifier.cpp
+++ b/apps/opencs/model/tools/verifier.cpp
@@ -1,33 +1,7 @@
 
 #include "verifier.hpp"
 
-#include <QTimer>
-
 #include "../doc/state.hpp"
 
-void CSMTools::Verifier::run()
-{
-    mStep = 0;
-
-    QTimer timer;
-
-    timer.connect (&timer, SIGNAL (timeout()), this, SLOT (verify()));
-
-    timer.start (0);
-
-    exec();
-}
-
-void CSMTools::Verifier::abort()
-{
-    exit();
-}
-
-void CSMTools::Verifier::verify()
-{
-    ++mStep;
-    emit progress (mStep, 1000, CSMDoc::State_Verifying);
-
-    if (mStep>=1000)
-        exit();
-}
\ No newline at end of file
+CSMTools::Verifier::Verifier() : Operation (CSMDoc::State_Verifying)
+{}
diff --git a/apps/opencs/model/tools/verifier.hpp b/apps/opencs/model/tools/verifier.hpp
index 0e7fae19c..054f87169 100644
--- a/apps/opencs/model/tools/verifier.hpp
+++ b/apps/opencs/model/tools/verifier.hpp
@@ -1,33 +1,17 @@
 #ifndef CSM_TOOLS_VERIFIER_H
 #define CSM_TOOLS_VERIFIER_H
 
-#include <QThread>
+#include "operation.hpp"
 
 namespace CSMTools
 {
-    class Verifier : public QThread
+    class Verifier : public Operation
     {
-            Q_OBJECT
-
-            int mStep;
-
         public:
 
-            virtual void run();
+            Verifier();
 
-        signals:
-
-            void progress (int current, int max, int type);
-
-        public slots:
-
-            void abort();
-
-        private slots:
-
-            void verify();
     };
-
 }
 
 #endif