diff --git a/include/signal.h b/include/signal.h
index 8d6a426..f34e7f4 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -144,6 +144,7 @@ void on_start_new_measure (GtkWidget *btt_new_measure, gpointer data);
 void on_select_rules_first (GtkWidget *btt_new_measure, gpointer data);
 void on_measure_depends_on_a_single_event (GtkWidget *btt, gpointer data);
 void on_measure_depends_on_two_events (GtkWidget *btt, gpointer data);
+void on_measure_do_select_a_second_rules_set (GtkWidget *btt, gpointer data);
 void on_measure_single_event_occurences_nb (GtkWidget *btt, gpointer data);
 void on_measure_single_event_occurences_dates (GtkWidget *btt, gpointer data);
 void on_measure_single_event_occurences_situations (GtkWidget *btt, gpointer data);
diff --git a/include/widget.h b/include/widget.h
index 4d42f5a..9fec4e4 100644
--- a/include/widget.h
+++ b/include/widget.h
@@ -257,6 +257,8 @@ void *widget_measure_do_select_rules_first();
 void *widget_measure_do_depends_on_one_or_two_events();
 void *widget_measure_do_depends_on_a_single_event();
 void *widget_measure_do_depends_on_two_events();
+void *widget_measure_do_select_a_second_rules_set();
+void *widget_measure_do_choose_an_event_type();
 void *widget_measure_event_occurences_nb();
 void *widget_measure_event_occurences_dates();
 void *widget_measure_event_occurences_situations();
diff --git a/src/signal.c b/src/signal.c
index 43a996b..31c5fc2 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -391,9 +391,26 @@ void on_measure_depends_on_a_single_event (GtkWidget *btt, gpointer data)
 void on_measure_depends_on_two_events (GtkWidget *btt, gpointer data)
 {
     gtk_window_set_child (GTK_WINDOW (widget_get_main_window ()),
-                          GTK_WIDGET (widget_measure_do_depends_on_two_events()));
+                          GTK_WIDGET (widget_measure_do_select_a_second_rules_set()));
 }
 
+
+
+
+
+
+void on_measure_do_select_a_second_rules_set (GtkWidget *btt, gpointer data)
+{
+    gtk_window_set_child (GTK_WINDOW (widget_get_main_window ()),
+                          GTK_WIDGET (widget_measure_do_choose_an_event_type()));
+}
+
+
+
+
+
+
+
 void on_measure_single_event_occurences_nb (GtkWidget *btt, gpointer data)
 {
     gtk_window_set_child (GTK_WINDOW (widget_get_main_window ()),
diff --git a/src/widget/measure/dispatch.c b/src/widget/measure/dispatch.c
index 2655eba..385ff96 100644
--- a/src/widget/measure/dispatch.c
+++ b/src/widget/measure/dispatch.c
@@ -48,6 +48,10 @@ static GtkBox *select_rules_first_box;
 static GtkWidget *pressure;
 static GtkWidget *btt_select_rules_first;
 
+static GtkBox *select_second_rules_set_box;
+static GtkWidget *sizes_xy;
+static GtkWidget *btt_select_rules_second;
+
 static GtkBox *select_one_or_two_rules_events_box;
 static GtkWidget *balance;
 static GtkWidget *btt_select_first_of_two;
@@ -64,6 +68,7 @@ static GtkWidget *bridge;
 static GtkWidget *btt_time_elapsed;
 static GtkWidget *btt_event_in_between;
 
+static GtkBox *correlation_measures_box;  //TODO
 
 // Measure concerns
 //  - nb of occurences of the rule
@@ -138,13 +143,37 @@ void *widget_measure_do_depends_on_a_single_event()
     return measure_page;
 }
 
-void *widget_measure_do_depends_on_two_events()
+
+
+
+
+void *widget_measure_do_select_a_second_rules_set()
 {
+//    printf("do_select_a_second_rules_set \n");
+    select_second_rules_set_box= GTK_BOX (gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2));
+    sizes_xy = gtk_picture_new_for_filename
+        ("/home/jean/Gem-Graph/gem-graph-client/data/stamp/measure compass icon.png");
+    btt_select_rules_second = gtk_toggle_button_new_with_label ("select a second rules set");
+    g_signal_connect (btt_select_rules_second, "toggled",
+                      G_CALLBACK (on_measure_do_select_a_second_rules_set), NULL);
+
+    gtk_box_append (select_second_rules_set_box, GTK_WIDGET (sizes_xy));
+    gtk_box_append (select_second_rules_set_box, GTK_WIDGET (btt_select_rules_second));
+    gtk_box_append (measure_page, GTK_WIDGET (select_second_rules_set_box));
+
+    return measure_page;
+}
+
+void *widget_measure_do_choose_an_event_type()
+{
+//    printf("do_choose_an_event_type \n");
     gtk_box_remove (select_one_or_two_rules_events_box, GTK_WIDGET (btt_select_first_of_two));
 //  ici, il faut inactiver le btt_select_second_of_two
+    gtk_box_append (select_second_rules_set_box,
+                    gtk_toggle_button_new_with_label ("<  done  >  a second set of rules was selected"));
     two_rules_measures_box = GTK_BOX (gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2));
     bridge = gtk_picture_new_for_filename
-        ("/home/jean/Gem-Graph/gem-graph-client/data/stamp/bridge icon.png");
+        ("/home/jean/Gem-Graph/gem-graph-client/data/stamp/measure temperature icon.png");
     btt_time_elapsed = gtk_toggle_button_new_with_label ("time_elapsed");
     btt_event_in_between = gtk_toggle_button_new_with_label ("event_in_between");
     g_signal_connect (btt_time_elapsed, "toggled",
@@ -159,6 +188,12 @@ void *widget_measure_do_depends_on_two_events()
     return measure_page;
 }
 
+
+
+
+
+
+
 void *widget_measure_do_depends_on_one_or_two_events()
 {
     gtk_box_append (select_rules_first_box,