diff --git a/include/signal.h b/include/signal.h
index 52756ed..9b2effc 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -142,3 +142,5 @@ void on_clicked_topbar_right_measure (GtkWidget *btt_measure, gpointer data);
 
 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);
diff --git a/include/widget.h b/include/widget.h
index 53f4b16..6577b7a 100644
--- a/include/widget.h
+++ b/include/widget.h
@@ -254,4 +254,6 @@ void widget_let_us_create_a_complex_useless_and_expensive_tree (struct TreeNode_
 
 void *widget_measure_new();
 void *widget_measure_do_select_rules_first();
-void *widget_measure_do_xxx();
+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();
diff --git a/src/signal.c b/src/signal.c
index 23be041..ef7a814 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -364,21 +364,32 @@ void on_situations_box_do_reset (GtkWidget *btt_reset, GtkScrollbar *reset_scrol
 /*                               M E A S U R E S                              */
 /******************************************************************************/
 
-void on_clicked_topbar_right_measure (GtkWidget *btt_measure, gpointer data)
+void on_clicked_topbar_right_measure (GtkWidget *btt, gpointer data)
 {
     gtk_window_set_child (GTK_WINDOW (widget_get_main_window ()),
                           GTK_WIDGET (widget_get_measure_page()));
 }
 
-void on_start_new_measure (GtkWidget *btt_new_measure, gpointer data)
+void on_start_new_measure (GtkWidget *btt, gpointer data)
 {
     gtk_window_set_child (GTK_WINDOW (widget_get_main_window ()),
                           GTK_WIDGET (widget_measure_do_select_rules_first()));
 }
 
-void on_select_rules_first (GtkWidget *btt_new_measure, gpointer data)
+void on_select_rules_first (GtkWidget *btt, gpointer data)
 {
-    printf("on_select_rules_first()\n");
     gtk_window_set_child (GTK_WINDOW (widget_get_main_window ()),
-                          GTK_WIDGET (widget_measure_do_xxx()));
+                          GTK_WIDGET (widget_measure_do_depends_on_one_or_two_events()));
+}
+
+void on_measure_depends_on_a_single_event (GtkWidget *btt, gpointer data)
+{
+    gtk_window_set_child (GTK_WINDOW (widget_get_main_window ()),
+                          GTK_WIDGET (widget_measure_do_depends_on_a_single_event()));
+}
+
+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()));
 }
diff --git a/src/widget/measure/dispatch.c b/src/widget/measure/dispatch.c
index ae6680a..0afa622 100644
--- a/src/widget/measure/dispatch.c
+++ b/src/widget/measure/dispatch.c
@@ -40,7 +40,6 @@
 #define PARTITION_MEASURE 40
 
 static GtkBox *measure_page;
-static GtkWidget *label_empty;
 
 static GtkBox *edit_a_new_measure_box;
 static GtkWidget *caliper;
@@ -50,19 +49,40 @@ static GtkBox *select_rules_first_box;
 static GtkWidget *pressure;
 static GtkWidget *btt_select_rules_first;
 
-void *widget_measure_do_xxx()
+static GtkBox *select_one_or_two_rules_events_box;
+static GtkWidget *balance;
+static GtkWidget *btt_select_first_of_two;
+static GtkWidget *btt_select_second_of_two;
+
+void *widget_measure_do_depends_on_a_single_event() {printf("measure depends on a single event\n"); return measure_page;}
+void *widget_measure_do_depends_on_two_events() {printf("measure depends on two events\n"); return measure_page;}
+
+void *widget_measure_do_depends_on_one_or_two_events()
 {
-    printf("on_clicked_measure()  >>  dispatch.c / widget_measure_do_select_rules_first()\
-  >>  widget_measure_do_xxx()\n");
-    return NULL;
+    select_one_or_two_rules_events_box = GTK_BOX (gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2));
+    balance = gtk_picture_new_for_filename
+        ("/home/jean/Gem-Graph/gem-graph-client/data/stamp/balance icon.png");
+    btt_select_first_of_two = gtk_toggle_button_new_with_label ("measure depends on a single event");
+    btt_select_second_of_two = gtk_toggle_button_new_with_label ("measure depends on two events");
+    g_signal_connect (btt_select_first_of_two, "toggled",
+                      G_CALLBACK (on_measure_depends_on_a_single_event), NULL);
+    g_signal_connect (btt_select_second_of_two, "toggled",
+                      G_CALLBACK (on_measure_depends_on_two_events), NULL);
+
+    gtk_box_append (select_one_or_two_rules_events_box, GTK_WIDGET (balance));
+    gtk_box_append (select_one_or_two_rules_events_box, GTK_WIDGET (btt_select_first_of_two));
+    gtk_box_append (select_one_or_two_rules_events_box, GTK_WIDGET (btt_select_second_of_two));
+    measure_page = widget_get_measure_page();
+    gtk_box_append (measure_page, GTK_WIDGET (select_one_or_two_rules_events_box));
+
+    return measure_page;
 }
 
 void *widget_measure_do_select_rules_first ()
 {
-    printf("on_clicked_measure()  >>  dispatch.c / widget_measure_do_select_rules_first()\n");
     select_rules_first_box = GTK_BOX (gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2));
-    gtk_box_append (select_rules_first_box, GTK_WIDGET (gtk_picture_new_for_filename
-        ("/home/jean/Gem-Graph/gem-graph-client/data/stamp/measure pressure icon.png")));
+    pressure = gtk_picture_new_for_filename
+        ("/home/jean/Gem-Graph/gem-graph-client/data/stamp/measure pressure icon.png");
     btt_select_rules_first = gtk_toggle_button_new_with_label ("select rules first");
     g_signal_connect (btt_select_rules_first, "toggled",
                       G_CALLBACK (on_select_rules_first), NULL);
@@ -78,8 +98,6 @@ void *widget_measure_do_select_rules_first ()
 void *widget_get_measure_page()
 {
     measure_page = GTK_BOX (gtk_box_new (GTK_ORIENTATION_VERTICAL, 2));
-    label_empty = gtk_label_new ("");
-    gtk_widget_set_size_request (label_empty, 0, H_MY_SCREEN); // OK (required))
     edit_a_new_measure_box = GTK_BOX (gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 2));
     caliper = gtk_picture_new_for_filename
         ("/home/jean/Gem-Graph/gem-graph-client/data/stamp/measure caliper icon.png");