diff --git a/rrompy/utilities/base/types.py b/rrompy/utilities/base/types.py
index 15fdaef..127aa2e 100644
--- a/rrompy/utilities/base/types.py
+++ b/rrompy/utilities/base/types.py
@@ -1,53 +1,54 @@
 # Copyright (C) 2018 by the RROMPy authors
 #
 # This file is part of RROMPy.
 #
 # RROMPy is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # RROMPy is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 # GNU Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with RROMPy. If not, see <http://www.gnu.org/licenses/>.
 #
 
 from typing import TypeVar, List, Tuple, Dict, Any
 
 __all__ = ['TupleAny','ListAny','DictAny','ScOp','Np1D','Np2D','Np1DLst',
            'N2FSExpr','FenExpr','FenFunc','FenFuncSpace','HFEng','ROMEng',
-           'sampleEng','normEng','GenExpr','strLst','BfSExpr']
+           'sampleEng','normEng','paramVal','GenExpr','strLst','BfSExpr']
 
 # ANY
 TupleAny = Tuple[Any]
 ListAny = List[Any]
 DictAny = Dict[Any, Any]
 
 # SCIPY
 ScOp = TypeVar("Scipy sparse matrix for space operator")
 
 # NUMPY
 Np1D = TypeVar("NumPy 1D array")
 Np2D = TypeVar("NumPy 2D array-like")
 Np1DLst = TypeVar("NumPy 1D array or list of NumPy 1D array")
 N2FSExpr = TypeVar("NumPy 2D array, float or str")
 
 # FENICS
 FenExpr = TypeVar("FEniCS expression")
 FenFunc = TypeVar("FEniCS function")
 FenFuncSpace = TypeVar("FEniCS function space")
 
 # ENGINES
 HFEng = TypeVar("High fidelity engine")
 ROMEng = TypeVar("ROM engine")
 sampleEng = TypeVar("Sampling engine")
 normEng = TypeVar("Norm engine")
 
 # OTHERS
+paramVal = TypeVar("Parameter value tuple")
 GenExpr = TypeVar("Generic expression")
 strLst = TypeVar("str or list of str")
 BfSExpr = TypeVar("Boolean function or string")
diff --git a/rrompy/utilities/exception_manager/mode_assert.py b/rrompy/utilities/exception_manager/mode_assert.py
index 1050376..641c5eb 100644
--- a/rrompy/utilities/exception_manager/mode_assert.py
+++ b/rrompy/utilities/exception_manager/mode_assert.py
@@ -1,35 +1,35 @@
 # Copyright (C) 2018 by the RROMPy authors
 #
 # This file is part of RROMPy.
 #
 # RROMPy is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # RROMPy is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 # GNU Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with RROMPy. If not, see <http://www.gnu.org/licenses/>.
 #
 
 from rrompy.utilities.exception_manager import RROMPyException
 
-__all__ = ['RROMPy_READY', 'RROMPy_FRAGILE', 'purgeList']
+__all__ = ['RROMPy_READY', 'RROMPy_FRAGILE', 'modeAssert']
 
 RROMPy_READY = "ready"
 RROMPy_FRAGILE = "fragile"
 
 def modeAssert(mode, check = RROMPy_READY, message = ""):
     if isinstance(check, (tuple, list,)):
         if mode not in check:
             raise RROMPyException("Current mode not in {}. {}".format(check,
                                                                       message))
     else:
         if mode != check:
             raise RROMPyException("Current mode not {}. {}".format(check,
                                                                    message))