diff --git a/.gitignore b/.gitignore
index f19a515..bd8e414 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,7 @@
 __pycache__
 /archive
 .vscode
-.pytensils
+.venv
 .pytest_cache
 .coverage
 testing.py
\ No newline at end of file
diff --git a/pytensils/__init__.py b/pytensils/__init__.py
index cf99000..6ccf26b 100644
--- a/pytensils/__init__.py
+++ b/pytensils/__init__.py
@@ -1,3 +1,10 @@
+""" pytensils
+
+A Python package that provides general utility functions for managing
+configuration, user-logging, directories and data-types as well as
+a basic run-time profiler.
+"""
+
 import pytensils.config as config
 import pytensils.logging as logging
 import pytensils.utils as utils
diff --git a/pytensils/config.py b/pytensils/config.py
index 67ed385..cf8a35a 100644
--- a/pytensils/config.py
+++ b/pytensils/config.py
@@ -1,14 +1,6 @@
-"""
-Information
----------------------------------------------------------------------
-Name        : config.py
-Location    : ~/
-
-Description
----------------------------------------------------------------------
-Contains the `class` methods for managing configuration.
-"""
+""" Configuration management """
 
+from __future__ import annotations
 import os
 import json
 import copy
@@ -21,6 +13,23 @@
 
 
 class Handler():
+    """ A `class` that represents a configuration-handler.
+
+    Parameters
+    ----------
+    path : `str`
+        Directory path to the folder that contains the `file_name` of the
+            '.json' config-file.
+    file_name : `str`
+        File name of the '.json' config-file.
+    create: `bool`
+        `True` or `False`, creates an empty log-file, `file_name`
+            within `path` when `True`.
+    Logging: `pytensils.logging.Handler`
+        An instance of the `pytensils.logging.Handler` class that allows
+            for native 'pretty' user-logging of all `ValidationError`
+            exceptions.
+    """
 
     def __init__(
         self,
@@ -123,7 +132,8 @@ def __init__(
                     )
 
     def read(self) -> dict:
-        """ Reads a '.json' config-file and returns the content as a `dict`.
+        """ Reads a '.json' config-file, updates the config data
+        and returns the content as a `dict`.
         """
         with open(
             os.path.join(
@@ -164,6 +174,9 @@ def read(self) -> dict:
                     )
                 )
 
+                # Update the config data
+                self.data = copy.deepcopy(dict_object)
+
                 return dict_object
 
             except json.decoder.JSONDecodeError:
@@ -201,8 +214,7 @@ def read(self) -> dict:
                     )
 
     def write(self):
-        """ Writes a '.json' config-file.
-        """
+        """ Writes a '.json' config-file. """
         with open(
             os.path.join(
                 self.path,
@@ -218,17 +230,27 @@ def write(self):
 
     def validate(
         self,
-        dtypes: dict
+        dtypes: Union[dict, Handler],
     ) -> bool:
         """ Validates the config-file data against the dtypes in `dtypes`.
         Returns `True` when validation completes successfully.
 
         Parameters
         ----------
-        dtypes : `dict`
+        dtypes : Union[`dict`, `pytensils.config.Handler`]
             Dictionary object that contains the expected
                 configuration value dtypes.
         """
+        assert type(dtypes) in [dict, Handler], (
+            ''.join([
+                '{dtypes} must be either a `dict` or an instance of',
+                ' `pytensils.config.Handler`.'
+            ])
+        )
+
+        # Parse the config data as a dictionary
+        if isinstance(dtypes, Handler):
+            dtypes = dtypes.to_dict()
 
         # Validate instance
         self._validate_instance(dict_object=dtypes, parameter='dtypes')
@@ -251,8 +273,7 @@ def validate(
         return True
 
     def to_dict(self) -> dict:
-        """ Returns a dictionary object of the config-file data.
-        """
+        """ Returns a dictionary object of the config-file data. """
         return copy.deepcopy(self.data)
 
     def from_dict(
diff --git a/pytensils/errors.py b/pytensils/errors.py
index ad4e6bf..cfafde8 100644
--- a/pytensils/errors.py
+++ b/pytensils/errors.py
@@ -1,16 +1,8 @@
-"""
-Information
----------------------------------------------------------------------
-Name        : errors.py
-Location    : ~/
-Description
----------------------------------------------------------------------
-Contains the `class` exceptions for all native `pytensils` errors and
-all error accessor functions.
-"""
+""" errors """
 
 
 class config:
+    """ A `class` that contains all config-related errors. """
 
     # Exceptions
     class OSError(OSError):
diff --git a/pytensils/logging.py b/pytensils/logging.py
index 0b421eb..08029ed 100644
--- a/pytensils/logging.py
+++ b/pytensils/logging.py
@@ -1,13 +1,4 @@
-"""
-Information
----------------------------------------------------------------------
-Name        : logging.py
-Location    : ~/
-
-Description
----------------------------------------------------------------------
-Contains the `class` methods for 'pretty' user-logging.
-"""
+""" Pretty user-logging """
 
 import os
 import textwrap
@@ -31,16 +22,45 @@
 # Setup CPython logging
 pytensils = logging.getLogger('pytensils')
 pytensils.setLevel(level=logging.DEBUG)
+
+# Prevent propagation to the root logger to avoid duplicate messages
+pytensils.propagate = False
+
+# Setup a CPython logging stream handler
 debugger = logging.StreamHandler()
 debugger.setLevel(level=logging.DEBUG)
 debugger.setFormatter(fmt=logging.Formatter('[DEBUG] %(message)s'))
-pytensils.addHandler(hdlr=debugger)
+
+# Add the handler if it does not currently exist
+if not any(isinstance(h, logging.StreamHandler) for h in pytensils.handlers):
+    pytensils.addHandler(hdlr=debugger)
 
 # Setup tabulate
 tabulate.PRESERVE_WHITESPACE = True
 
 
 class Handler():
+    """ A `class` that represents a logging-handler.
+
+    Parameters
+    ----------
+    path : `str`
+        Directory path to the folder that contains the `file_name` of the
+            log-file.
+    file_name : `str`
+        File name of the log-file.
+    description : `str`
+        Information about the executed Python job run.
+    metadata : `dict`
+        Environment parameters to display as metadata about the executed
+            Python job run.
+    create: `bool`
+        `True` or `False`, creates an empty log-file, `file_name`
+            within `path` when `True`.
+    debug_console: `bool`
+        `True` or `False`, outputs the logging content to the console
+            output when `True` using `logging.debug()`.
+    """
 
     def __init__(
         self,
@@ -51,7 +71,7 @@ def __init__(
         create: bool = True,
         debug_console: bool = False
     ):
-        """ Initializes an instance of the logger-handler class.
+        """ Initializes an instance of the logging-handler class.
 
         Parameters
         ----------
diff --git a/pytensils/profiler.py b/pytensils/profiler.py
index bbb70d6..40965b3 100644
--- a/pytensils/profiler.py
+++ b/pytensils/profiler.py
@@ -1,13 +1,4 @@
-"""
-Information
----------------------------------------------------------------------
-Name        : profiler.py
-Location    : ~/
-
-Description
----------------------------------------------------------------------
-Contains utility functions for profiling functions.
-"""
+""" Run-time profiling """
 
 import time
 import datetime as dt
@@ -31,7 +22,7 @@ def wrapper(*args, **kwargs):
         result = func(*args, **kwargs)
         t2 = time.time()
         td = dt.timedelta(seconds=(t2-t1))
-        print("\n[INFO] Function {%s()} executed in %s hh:mm:ss" % (
+        print("\n[INFO] Function {%s()} executed in %s hh:mm:ss." % (
                 func.__name__,
                 td
             )
diff --git a/pytensils/utils.py b/pytensils/utils.py
index 8b497b3..2eff889 100644
--- a/pytensils/utils.py
+++ b/pytensils/utils.py
@@ -1,13 +1,4 @@
-"""
-Information
----------------------------------------------------------------------
-Name        : utils.py
-Location    : ~/
-
-Description
----------------------------------------------------------------------
-Contains utility functions for managing directories and data-types.
-"""
+""" Directory and data-type utilities """
 
 import os
 import ast
@@ -55,6 +46,7 @@ def generate_output_directory(
 def as_type(
     value: str,
     return_dtype: Literal[
+        'none',
         'str',
         'int',
         'float',
@@ -88,6 +80,12 @@ def as_type(
     """
 
     try:
+        if (
+            return_dtype.strip().upper() == 'NONE'
+            and not ast.literal_eval(value)
+        ):
+            return None
+
         if return_dtype.strip().upper() == 'STR':
             return str(value)
 
diff --git a/setup.cfg b/setup.cfg
index b8496e3..cee1b6c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,7 +4,6 @@ description = A Python package that provides general utility functions for manag
 long_description = file: README.md
 long_description_content_type = text/markdown
 author = Tom Eleff
-author_email = eleffthomas@gmail.com
 url = https://github.com/thomaseleff/pytensils
 project_urls =
     Issues = https://github.com/thomaseleff/pytensils/issues
diff --git a/tests/resources/closes-on-exception-filenotfounderror.log b/tests/resources/closes-on-exception-filenotfounderror.log
index 12cfc95..037db88 100644
--- a/tests/resources/closes-on-exception-filenotfounderror.log
+++ b/tests/resources/closes-on-exception-filenotfounderror.log
@@ -3,5 +3,5 @@
     
     Generates close-on-exception content for `pytenstils.logging`
         functionality.
-    
-        Start time    : 2024-07-08 18:33:26
+
+        Start time    : 2024-12-06 18:04:46
diff --git a/tests/resources/closes-on-exception-notimplementederror.log b/tests/resources/closes-on-exception-notimplementederror.log
index 0fab4e1..bdb89de 100644
--- a/tests/resources/closes-on-exception-notimplementederror.log
+++ b/tests/resources/closes-on-exception-notimplementederror.log
@@ -4,7 +4,7 @@
     Generates close-on-exception content for `pytenstils.logging`
         functionality.
     
-        Start time    : 2024-07-08 18:33:26
+        Start time    : 2024-12-06 18:04:46
     
     --------------------------------------------------------------------------
     
@@ -27,9 +27,9 @@
     --------
     
     Run-time performance summary.
-    
-        Start time    : 18:33:26.617300
-        End time      : 18:33:26.893199
-        Run time      : 00:00:00.275899
 
+        Start time    : 18:04:46.649282
+        End time      : 18:04:46.847472
+        Run time      : 00:00:00.198190
+ 
     --------------------------------------------------------------------------
diff --git a/tests/resources/closes-on-exception-oserror.log b/tests/resources/closes-on-exception-oserror.log
index 12cfc95..49c74eb 100644
--- a/tests/resources/closes-on-exception-oserror.log
+++ b/tests/resources/closes-on-exception-oserror.log
@@ -4,4 +4,5 @@
     Generates close-on-exception content for `pytenstils.logging`
         functionality.
     
-        Start time    : 2024-07-08 18:33:26
+        Start time    : 2024-12-06 18:04:46
+
diff --git a/tests/resources/closes-on-exception-success.log b/tests/resources/closes-on-exception-success.log
index 7679932..4490bf0 100644
--- a/tests/resources/closes-on-exception-success.log
+++ b/tests/resources/closes-on-exception-success.log
@@ -4,7 +4,7 @@
     Generates close-on-exception content for `pytenstils.logging`
         functionality.
     
-        Start time    : 2024-07-08 18:33:25
+        Start time    : 2024-12-06 18:04:45
     
     --------------------------------------------------------------------------
     
@@ -13,8 +13,8 @@
     
     Run-time performance summary.
     
-        Start time    : 18:33:25.566032
-        End time      : 18:33:25.737897
-        Run time      : 00:00:00.171865
+        Start time    : 18:04:45.812073
+        End time      : 18:04:45.939506
+        Run time      : 00:00:00.127433
 
     --------------------------------------------------------------------------
diff --git a/tests/resources/closes-on-exception-typeerror.log b/tests/resources/closes-on-exception-typeerror.log
index 12cfc95..72fd1b4 100644
--- a/tests/resources/closes-on-exception-typeerror.log
+++ b/tests/resources/closes-on-exception-typeerror.log
@@ -4,4 +4,4 @@
     Generates close-on-exception content for `pytenstils.logging`
         functionality.
     
-        Start time    : 2024-07-08 18:33:26
+        Start time    : 2024-12-06 18:04:46
\ No newline at end of file
diff --git a/tests/resources/closes-on-exception-validationerror.log b/tests/resources/closes-on-exception-validationerror.log
index 12cfc95..f345a54 100644
--- a/tests/resources/closes-on-exception-validationerror.log
+++ b/tests/resources/closes-on-exception-validationerror.log
@@ -4,4 +4,4 @@
     Generates close-on-exception content for `pytenstils.logging`
         functionality.
     
-        Start time    : 2024-07-08 18:33:26
+        Start time    : 2024-12-06 18:04:46
diff --git a/tests/resources/closes-on-exception.log b/tests/resources/closes-on-exception.log
index b35cc44..b8e4096 100644
--- a/tests/resources/closes-on-exception.log
+++ b/tests/resources/closes-on-exception.log
@@ -4,7 +4,7 @@
     Generates close-on-exception content for `pytenstils.logging`
         functionality.
     
-        Start time    : 2024-07-08 18:33:25
+        Start time    : 2024-12-06 18:04:46
     
     --------------------------------------------------------------------------
     
@@ -16,7 +16,7 @@
     >>> ZeroDivisionError: division by zero
     
         Filename       : T:\Documents\Projects\[...]sils\tests\test_logging.py
-        Line Number    : Line 329
+        Line Number    : Line 361
         Function       : divide_by_zero()
         Exception      : ZeroDivisionError
     
@@ -27,8 +27,8 @@
     
     Run-time performance summary.
     
-        Start time    : 18:33:25.823342
-        End time      : 18:33:26.211961
-        Run time      : 00:00:00.388619
+        Start time    : 18:04:46.014435
+        End time      : 18:04:46.316471
+        Run time      : 00:00:00.302036
 
     --------------------------------------------------------------------------
diff --git a/tests/resources/example.log b/tests/resources/example.log
index 4288f21..4e504c9 100644
--- a/tests/resources/example.log
+++ b/tests/resources/example.log
@@ -4,7 +4,9 @@
     Generates example user-log content for all `pytenstils.logging`
         functionality.
     
-        Start time             : 2024-07-08 18:33:24
+
+        Start time             : 2024-12-06 18:04:44
+     
         Extra parameter (1)    : 1
         Extra parameter (2)    : 2
     
@@ -74,8 +76,8 @@
     
     Run-time performance summary.
     
-        Start time    : 18:33:24.702949
-        End time      : 18:33:24.981427
-        Run time      : 00:00:00.278478
+        Start time    : 18:04:44.965261
+        End time      : 18:04:45.237671
+        Run time      : 00:00:00.272410
 
     --------------------------------------------------------------------------
diff --git a/tests/resources/test_config.log b/tests/resources/test_config.log
index 4bd7a25..392c3dd 100644
--- a/tests/resources/test_config.log
+++ b/tests/resources/test_config.log
@@ -3,8 +3,8 @@
     
     Environment information summary.
     
-        Start time    : 2024-07-08 18:33:24
-    
+        Start time    : 2024-12-06 18:04:44
+   
     --------------------------------------------------------------------------
     
     Configuration validation
@@ -31,8 +31,8 @@
     
     Run-time performance summary.
     
-        Start time    : 18:33:24.471101
-        End time      : 18:33:24.680127
-        Run time      : 00:00:00.209026
+        Start time    : 18:04:44.750909
+        End time      : 18:04:44.938004
+        Run time      : 00:00:00.187095
 
     --------------------------------------------------------------------------
diff --git a/tests/test_config.py b/tests/test_config.py
index 82b4ce6..4595581 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -202,7 +202,7 @@ def test_from_dict_success(
     }
 
 
-def test_validate_success(
+def test_validate_from_dict_success(
     CONFIG_FIXTURE: config.Handler,
     DTYPES_FIXTURE: config.Handler
 ):
@@ -212,6 +212,25 @@ def test_validate_success(
     assert not CONFIG_FIXTURE.validation_errors
 
 
+def test_validate_from_config_handler_success(
+    CONFIG_FIXTURE: config.Handler,
+    DTYPES_FIXTURE: config.Handler
+):
+    assert CONFIG_FIXTURE.validate(
+        dtypes=DTYPES_FIXTURE
+    )
+    assert not CONFIG_FIXTURE.validation_errors
+
+
+def test_validate_assertionerror(
+    CONFIG_FIXTURE: config.Handler
+):
+    with pytest.raises(AssertionError):
+        CONFIG_FIXTURE.validate(
+            dtypes='invalid-type'
+        )
+
+
 def test_validate_instance_validationerror(CONFIG_FIXTURE: config.Handler):
     with pytest.raises(errors.config.ValidationError):
         CONFIG_FIXTURE._validate_instance(
diff --git a/tests/test_logging.py b/tests/test_logging.py
index b88db94..5572f03 100644
--- a/tests/test_logging.py
+++ b/tests/test_logging.py
@@ -10,6 +10,7 @@
 """
 
 import os
+from io import StringIO
 import pandas as pd
 import logging as clogging
 import pytest
@@ -228,8 +229,7 @@ def test_write_typeerror():
         )
 
 
-def test_debug_console(caplog: pytest.LogCaptureFixture):
-    caplog.set_level(clogging.DEBUG)
+def test_debug_console():
 
     # Initialize logging
     Logging = logging.Handler(
@@ -241,19 +241,51 @@ def test_debug_console(caplog: pytest.LogCaptureFixture):
         debug_console=True
     )
 
-    # Create debug console output
-    Logging.write(content='Log-content-for-the-output-console')
-
-    # Cleanup
-    os.remove(
-        os.path.join(
-            os.path.dirname(__file__),
-            'resources',
-            'python.log'
-        )
+    # Ensure that a StreamHandler is attached
+    handler = next(
+        (
+            h for h in logging.pytensils.handlers if isinstance(
+                h,
+                clogging.StreamHandler
+            )
+        ),
+        None
     )
+    assert handler is not None
+
+    # Replace the StreamHandler with StringIO
+    log_output = StringIO()
+    original_stream = handler.stream
+    handler.setStream(log_output)
+
+    try:
+
+        # Loging
+        test_message = "Log-content-for-the-output-console"
+        Logging.write(test_message)
+
+        # Flush the handler and retrieve the log output
+        handler.flush()
+        log_output.seek(0)
+        captured_logs = log_output.read()
+
+        # Ensure the log message is present in the captured output
+        assert test_message in captured_logs
+        assert "DEBUG" in captured_logs
 
-    assert 'Log-content-for-the-output-console' in caplog.text
+    finally:
+
+        # Restore the StreamHandler
+        handler.setStream(original_stream)
+
+        # Cleanup
+        os.remove(
+            os.path.join(
+                os.path.dirname(__file__),
+                'resources',
+                'python.log'
+            )
+        )
 
 
 def test_pretty_dict_valueerror():
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 4cb2704..951e7c6 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -36,6 +36,10 @@ def test_generate_output_directory_oserror():
         )
 
 
+def test_as_type_success_none():
+    assert not utils.as_type(value='None', return_dtype='none')
+
+
 def test_as_type_success_str():
     assert utils.as_type(value='ABC') == 'ABC'