diff --git a/notes_tools/generate_bilan/__main__.py b/notes_tools/generate_bilan/__main__.py
index 771f206..7e66390 100644
--- a/notes_tools/generate_bilan/__main__.py
+++ b/notes_tools/generate_bilan/__main__.py
@@ -58,16 +58,26 @@ def main():
             action="store_true",
             dest="debug_level",
             help="Enable debug")
+    parser.add_option("-l",
+            "--list",
+            action="store_true",
+            dest="list",
+            help="List classe and possible bilan")
 
     (options, args) = parser.parse_args()
 
-    if not options.classe:
-        logger.error("Need to pass a class with -c. See -h for help")
-        sys.exit()
     if options.debug_level:
         logger.setLevel(logging.DEBUG)
 
-    if options.term:
+    if options.list:
+        from .bilan_tools import print_bilan
+        logger.info("Listing all bilan in {}".format(options.path))
+        print_bilan(options.path)
+
+    elif options.term:
+        if not options.classe:
+            logger.error("Need to pass a class with -c. See -h for help")
+            sys.exit()
         logger.info("Creating term {} bilan".format(options.term))
         from .term_bilan import term_bilan
         if options.template:
@@ -82,6 +92,9 @@ def main():
                 template)
 
     elif options.eval:
+        if not options.classe:
+            logger.error("Need to pass a class with -c. See -h for help")
+            sys.exit()
         logger.info("Creating {} bilan".format(options.eval))
         from .eval_bilan import eval_bilan
         if options.template:
@@ -96,7 +109,7 @@ def main():
                 template)
 
     else:
-        logger.error("Need to pass a evaluation name with -e or the term number with -t. See -h for help")
+        logger.error("Not enough arguments. See -h for help")
         sys.exit()
 
 
diff --git a/notes_tools/generate_bilan/bilan_tools.py b/notes_tools/generate_bilan/bilan_tools.py
new file mode 100755
index 0000000..ea82b4c
--- /dev/null
+++ b/notes_tools/generate_bilan/bilan_tools.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+from notes_tools.tools import extract_flat_marks, get_class_ws, list_classes
+import pandas as pd
+import numpy as np
+import xlrd
+from path import Path
+
+import logging
+logger = logging.getLogger("generate_bilan")
+
+
+def print_bilan_of(classe_ws):
+    """TODO: Docstring for list_bilan.
+
+    :param arg1: TODO
+    :returns: TODO
+
+    """
+    try:
+        df = extract_flat_marks(classe_ws)
+    # TODO: il faudrait renommer l'exeption |lun. nov. 28 16:17:21 EAT 2016
+    except ValueError:
+        print("Erreur avec cette feuille de calcul")
+        return None
+    print("Évaluations")
+    for e in df["Nom"].unique():
+        print("\t-{}".format(e))
+    print("Trimestre")
+    for t in df['Trimestre'].unique():
+        print("\t-Trimestre {}".format(t))
+
+def print_bilan(path):
+    """ List all bilan which can be generate in the directory
+
+    :param path: the directory
+    :returns: TODO
+
+    """
+    print("Liste des bilans disponibles")
+    for c in list_classes(path):
+        print("Classe de {}".format(c))
+        ws = get_class_ws(c, path)
+        print_bilan_of(ws)
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del 
diff --git a/notes_tools/tools/__init__.py b/notes_tools/tools/__init__.py
index 4f548ef..8eb5df9 100644
--- a/notes_tools/tools/__init__.py
+++ b/notes_tools/tools/__init__.py
@@ -2,7 +2,7 @@
 # encoding: utf-8
 
 
-from .extract import extract_flat_marks, get_class_ws
+from .extract import extract_flat_marks, get_class_ws, list_classes
 from .df_marks_manip import digest_flat_df#, students_pov
 #from .eval_tools import select_eval, get_present_absent, keep_only_presents
 from .plottings import radar_graph
diff --git a/notes_tools/tools/extract.py b/notes_tools/tools/extract.py
index 1d480d6..03a09dd 100644
--- a/notes_tools/tools/extract.py
+++ b/notes_tools/tools/extract.py
@@ -51,7 +51,7 @@ def check_students(dfs, notStudent = notStudent):
     dfs_students = [extract_students(df) for df in dfs]
 
     if not are_equal(dfs_students):
-        raise ValueError("Not same list of students between df1 = {} ans df2 = {}".format(df1, df2))
+        raise ValueError("Not same list of students amoung worksheets")
 
     return dfs_students[0]