diff --git a/include/dynamic-graph/signal-base.h b/include/dynamic-graph/signal-base.h
index 0f6eb341f48e02841c116e199712e9348df13035..ab379d74ebe5aa209096681127fd13dc5c9ac010 100644
--- a/include/dynamic-graph/signal-base.h
+++ b/include/dynamic-graph/signal-base.h
@@ -20,7 +20,7 @@
 # include <string>
 # include <sstream>
 # include <iostream>
-
+# include <typeinfo>
 # include <boost/noncopyable.hpp>
 
 # include <dynamic-graph/fwd.hh>
@@ -72,6 +72,9 @@ namespace dynamicgraph
       return name;
     }
 
+    void getClassName(std::string & aClassName) const
+    { aClassName = typeid(this).name(); }
+
     virtual void setPeriodTime (const Time&)
     {}
 
diff --git a/include/dynamic-graph/signal-ptr.t.cpp b/include/dynamic-graph/signal-ptr.t.cpp
index 82b03bd414f6169687605a5faab0e763983d46bd..5f9da340275ea65d854605e5ed19ae2716b5faa0 100644
--- a/include/dynamic-graph/signal-ptr.t.cpp
+++ b/include/dynamic-graph/signal-ptr.t.cpp
@@ -121,9 +121,12 @@ namespace dynamicgraph
 	    transmitAbstract = false;
 	    DG_THROW ExceptionSignal( ExceptionSignal::PLUG_IMPOSSIBLE,
 				      "Compl. Uncompatible types for plugin.",
-				      "(while trying to plug <%s> on <%s>).",
+				      "(while trying to plug <%s> on <%s>)" 
+                                      " with types <%s> on <%s>.",
 				      unknown_ref->getName ().c_str (),
-				      this->getName ().c_str ());
+				      this->getName ().c_str (),
+                                      typeid(T).name(),
+                                      typeid(unknown_ref).name());
 	  }
       }
     else
diff --git a/include/dynamic-graph/signal.h b/include/dynamic-graph/signal.h
index e06aa88d6b3d49a7cd20a865820a47c7ebcd0b1b..d70f1fc34e123d0372e1d4305145e25dd9e2f122 100644
--- a/include/dynamic-graph/signal.h
+++ b/include/dynamic-graph/signal.h
@@ -30,7 +30,6 @@
 #include <dynamic-graph/exception-signal.h>
 #include <dynamic-graph/signal-base.h>
 
-
 #ifdef HAVE_LIBBOOST_THREAD
 #include <boost/thread.hpp>
 #endif
@@ -126,7 +125,9 @@ protected:
   virtual inline const T& operator ()( const Time & t ){ return access(t); }
   virtual Signal<T,Time>& operator= ( const T& t );
   inline operator const T&   () const { return accessCopy (); }
-
+  virtual void getClassName(std::string & aClassName) const
+  { aClassName = typeid(this).name(); }
+      
 
  public:
   virtual void checkCompatibility  () { throw Tcopy; }