diff --git a/hyppopy/globals.py b/hyppopy/globals.py
index 7d74106..0e67e87 100644
--- a/hyppopy/globals.py
+++ b/hyppopy/globals.py
@@ -1,34 +1,40 @@
 # Hyppopy - A Hyper-Parameter Optimization Toolbox
 #
 # Copyright (c) German Cancer Research Center,
 # Division of Medical Image Computing.
 # All rights reserved.
 #
 # This software is distributed WITHOUT ANY WARRANTY; without
 # even the implied warranty of MERCHANTABILITY or FITNESS FOR
 # A PARTICULAR PURPOSE.
 #
 # See LICENSE
 
 import os
 import sys
 import logging
+from enum import Enum
 
 ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
 sys.path.insert(0, ROOT)
 
 LIBNAME = "hyppopy"
 TESTDATA_DIR = os.path.join(ROOT, *(LIBNAME, "tests", "data"))
 
 HYPERPARAMETERPATH = "hyperparameter"
 SETTINGSPATH = "settings"
 FUNCTIONSIMULATOR_DATAPATH = os.path.join(os.path.join(ROOT, LIBNAME), "virtualparameterspace")
 
 SUPPORTED_DOMAINS = ["uniform", "normal", "loguniform", "categorical"]
 SUPPORTED_DTYPES = ["int", "float", "str"]
 
 DEFAULTGRIDFREQUENCY = 10
 
 LOGFILENAME = os.path.join(ROOT, '{}_log.log'.format(LIBNAME))
 DEBUGLEVEL = logging.DEBUG
 logging.basicConfig(filename=LOGFILENAME, filemode='w', format='%(levelname)s: %(name)s - %(message)s')
+
+
+class MPI_TAGS(Enum):
+     MPI_SEND_DATA = 55
+     MPI_SEND_TRIALS = 99