diff --git a/aichopen_tools/logger.py b/aichopen_tools/logger.py
index b7713fa..eb8231b 100644
--- a/aichopen_tools/logger.py
+++ b/aichopen_tools/logger.py
@@ -23,6 +23,12 @@ def filter(self, record):
 
 class LoggerFactory:
     output_files = []
+    
+    DEBUG = logging.DEBUG
+    INFO = logging.INFO
+    WARN = logging.WARN
+    CRITICAL = logging.CRITICAL
+    
     min_stdout = logging.DEBUG
     max_stdout = logging.INFO
     min_stdoerr = logging.WARN