diff --git a/invesalius/session.py b/invesalius/session.py
index a603588..c83850f 100644
--- a/invesalius/session.py
+++ b/invesalius/session.py
@@ -1,51 +1,10 @@
-#--------------------------------------------------------------------------
-# Software:     InVesalius - Software de Reconstrucao 3D de Imagens Medicas
-# Copyright:    (C) 2001  Centro de Pesquisas Renato Archer
-# Homepage:     http://www.softwarepublico.gov.br
-# Contact:      invesalius@cti.gov.br
-# License:      GNU - GPL 2 (LICENSE.txt/LICENCA.txt)
-#--------------------------------------------------------------------------
-#    Este programa e software livre; voce pode redistribui-lo e/ou
-#    modifica-lo sob os termos da Licenca Publica Geral GNU, conforme
-#    publicada pela Free Software Foundation; de acordo com a versao 2
-#    da Licenca.
-#
-#    Este programa eh distribuido na expectativa de ser util, mas SEM
-#    QUALQUER GARANTIA; sem mesmo a garantia implicita de
-#    COMERCIALIZACAO ou de ADEQUACAO A QUALQUER PROPOSITO EM
-#    PARTICULAR. Consulte a Licenca Publica Geral GNU para obter mais
-#    detalhes.
-#--------------------------------------------------------------------------
-
-
-
-class Session(object)
-    def __init__(self):
-        self.project_state = const.PROJ_FREE
-        # const.PROJ_FREE
-        # const.PROJ_OPEN
-        # const.PROJ_CHANGE
-        self.language = const.DEFAULT_LANG # en
-        self.imagedata_reformat = const.DEFAULT_REFORMAT # 1
-        self.layout = const.DEFAULT_LAYOUT #
-                                           # const.LAYOUT_RAPID_PROTOTYPING,
-                                           # const.LAYOUT_RADIOLOGY,
-                                           # const.LAYOUT_NEURO_NAVIGATOR,
-                                           # const.LAYOUT_ODONTOLOGY
-
-
-
-
-# USE PICKLE / PLIST !!!!!!
-# external - possibly inside controller
-#    def SetFileName(self, filename)
-#        # try to load config file from home/.invesalius
-#        load = self.Load(filename)
-#            if load:
-#                config = InVesaliusConfig
-        
-#    def Load(self, filename):
-#        # TODO: which file representation?
-#        # config?
-#        # plist?
-#        pass
+import constants as const
+from utils import Singleton
+
+class Session(object):
+    # Only one project will be initialized per time. Therefore, we use
+    # Singleton design pattern for implementing it
+    __metaclass__= Singleton
+
+    def __init__(self):
+        self.project_status = const.NEW_PROJECT
\ No newline at end of file
--
libgit2 0.21.2