diff --git a/cybertools/process/README.txt b/cybertools/process/README.txt
index e60d2f6..b0ba1e8 100644
--- a/cybertools/process/README.txt
+++ b/cybertools/process/README.txt
@@ -1,8 +1,6 @@
 Business Process Management
 ===========================
 
-  ($Id$)
-
 We start with the definition of a simple process:
 
   startActivity --> n01 --> endActivity
@@ -28,15 +26,15 @@ process' end activity:
 So let's now associate an action handler with the process' activitys:
 
   >>> from zope.component import provideAdapter, adapts
-  >>> from zope.interface import implements
+  >>> from zope.interface import implementer
   >>> from cybertools.process.interfaces import IActivity, IActionHandler
 
   >>> class DummyHandler(object):
-  ...     implements(IActionHandler)
   ...     adapts(IActivity)
   ...     def __init__(self, context): pass
   ...     def handle(self, execution):
-  ...         print 'working.'
+  ...         print('working.')
+  >>> DummyHandler = implementer(IActionHandler)(DummyHandler)
 
   >>> provideAdapter(DummyHandler)
   >>> execution = process.execute()
diff --git a/cybertools/process/definition.py b/cybertools/process/definition.py
index 4953fc0..0e6ca8f 100644
--- a/cybertools/process/definition.py
+++ b/cybertools/process/definition.py
@@ -1,38 +1,18 @@
-#
-#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
-#
-#  This program is free software; you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation; either version 2 of the License, or
-#  (at your option) any later version.
-#
-#  This program 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 General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software
-#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-#
+# cybertools.process.definition
 
-"""
-Process definitions.
-
-$Id$
+""" Process definitions.
 """
 
 from zope import component
-from zope.interface import implements
+from zope.interface import implementer
 from cybertools.process.interfaces import IActivity, IProcess
 from cybertools.process.interfaces import IActionHandler
 from cybertools.process.execution import Execution
 
 
+@implementer(IActivity)
 class Activity(object):
 
-    implements(IActivity)
-
     def __init__(self, name=u'', title=u'', handlerName=''):
         self._successors = set()
         self._handlerName = handlerName
@@ -61,10 +41,9 @@ class Activity(object):
         return execution
 
 
+@implementer(IProcess)
 class Process(object):
 
-    implements(IProcess)
-
     def __init__(self):
         self._startActivity = Activity()
 
diff --git a/cybertools/process/execution.py b/cybertools/process/execution.py
index 7a19c74..1c415f5 100644
--- a/cybertools/process/execution.py
+++ b/cybertools/process/execution.py
@@ -1,37 +1,17 @@
-#
-#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
-#
-#  This program is free software; you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation; either version 2 of the License, or
-#  (at your option) any later version.
-#
-#  This program 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 General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software
-#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-#
+# cybertools.process.execution
 
-"""
-Execution of a process.
-
-$Id$
+""" Execution of a process.
 """
 
-from zope.interface import implements
+from zope.interface import implementer
 from zope.component import adapts
 from cybertools.process.interfaces import IActivity, IExecution
 from cybertools.process.interfaces import IWorkItem, IActionHandler
 
 
+@implementer(IExecution)
 class Execution(object):
 
-    implements(IExecution)
-
     def __init__(self, parent=None):
         self._currentActivity = None
         self._workItem = None
@@ -65,10 +45,9 @@ class Execution(object):
             successor.execute(execution)
 
 
+@implementer(IWorkItem)
 class WorkItem(object):
 
-    implements(IWorkItem)
-
     def __init__(self, execution):
         self._execution = execution
         self._activity = execution.currentActivity
@@ -88,11 +67,11 @@ class WorkItem(object):
         self.execution.trigger()
 
 
+@implementer(IActionHandler)
 class WorkActionHandler(object):
     """ A simple action handler that creates a work item.
     """
 
-    implements(IActionHandler)
     adapts(IActivity)
 
     def __init__(self, context):