diff --git a/src/fsm.c b/src/fsm.c
index d131a74..d49b922 100644
--- a/src/fsm.c
+++ b/src/fsm.c
@@ -34,23 +34,35 @@
 #include "../include/widget.h"
 
 
+/******************************************************************************/
+/*           Each state of the finite state machine (fsm) must be             */
+/*                - saved at the end of a work session and                    */
+/*                - reread at the start of a new session.                     */
+/*                                                                            */
+/*              No state of the fsm should be stored elsewhere.               */
+/*             No fsm transition needs to be executed elsewhere.              */
+/******************************************************************************/
+
+
+
 /******************************************************************************/
 /*                              S T A T E S                                   */
 /******************************************************************************/
 
-static int choice_EXEC_EDIT = EXEC;
-static int choice_STATE_RULES_DATA = STATE;
 static int preferences_have_been_modified = FALSE;
-
-int  fsm_get_exec_edit () {return choice_EXEC_EDIT;}
-int  fsm_get_state_rules_data () {return choice_STATE_RULES_DATA;}
-
 void  fsm_set_preferences_state (bool value) {preferences_have_been_modified = value;}
 bool  fsm_get_preferences_state () {return preferences_have_been_modified;}
 //    preferences_have_been_modified
 //    and should be stored before closing the current session.   TODO
 
 
+static int choice_EXEC_EDIT = EXEC;
+static int choice_STATE_RULES_DATA = STATE;
+
+int  fsm_get_exec_edit () {return choice_EXEC_EDIT;}
+int  fsm_get_state_rules_data () {return choice_STATE_RULES_DATA;}
+
+
 /******************************************************************************/
 /*                          T R A N S I T I O N S                             */
 /******************************************************************************/
@@ -76,6 +88,41 @@ void fsm_set_state_rules_data (int choice)
 
 
 
+
+
+/******************************************************************************/
+/*                           M E A S U R E M E N T S                          */
+/******************************************************************************/
+//  An editable list of measurements is maintained.  (add, remove)
+//  Each measurement can be activated or silenced.
+
+//  The measures relate to
+//  - the number of occurrences of the rule,
+//  - the number of objects or situations before/after the rule was applied,
+//  - the time (date) of the event,
+//  - the time elapsed between two events,
+//  - the occurrence of events C between events A and B
+
+//  When a list of measurements is established, it is possible to evaluate
+//  if the results of a measurement are correlated with some other results.
+
+
+
+
+
+/******************************************************************************/
+/*                               R E S U L T S                                */
+/******************************************************************************/
+//  An editable list of displayable results is maintained. (add, remove, display)
+
+//  A preferred presentation should be available for each result.
+//  NB :  "graph", "chart", "plot" and "diagram" are ambiguous terms.
+
+
+
+
+
+
 /******************************************************************************/
 /*                             D E B U G G E R S                              */
 /******************************************************************************/
@@ -106,22 +153,3 @@ static void debug_printing (int choice, int value, int sub_automaton)
     }
 }
 
-
-
-/******************************************************************************/
-/*                N O N   E X C L U S I V E   S E L E C T I O N S             */
-/******************************************************************************/
-//                                    ?
-
-
-
-/******************************************************************************/
-/*                               M E A S U R E S                              */
-/******************************************************************************/
-//  list of measurements requested by the user
-//  this list is editable (see widget / measure)
-
-//  the results of each measurement can be displayed in diagrams (charts,...)
-//  liste des diagrammes
-
-