diff --git a/README.rst b/README.rst
index 51264c7..2659f36 100644
--- a/README.rst
+++ b/README.rst
@@ -92,6 +92,16 @@ using the list's ``save()`` method::
    
    sp_list.save()
 
+You can also approve or reject sharepoint workflow tasks::
+
+   sp_list = site.lists['ListName']
+   
+   # Approve a task
+   sp_list.rows[0].approve()
+
+   # Reject a task
+   sp_list.rows[1].reject()
+
 Consult the ``descriptor_set()`` methods in ``sharepoint.lists.types`` module
 for more information about setting SharePoint list fields.
 
diff --git a/sharepoint/lists/__init__.py b/sharepoint/lists/__init__.py
index 74d5d96..9807981 100644
--- a/sharepoint/lists/__init__.py
+++ b/sharepoint/lists/__init__.py
@@ -9,7 +9,7 @@
 from lxml import etree
 from lxml.builder import E
 
-from sharepoint.xml import SP, namespaces, OUT
+from sharepoint.xml import SP, namespaces, OUT, SPW, MY
 from sharepoint.lists import moderation
 from sharepoint.lists.types import type_mapping, default_type, UserField, LookupField
 from sharepoint.lists.attachments import SharePointAttachments
@@ -18,7 +18,6 @@
 
 uuid_re = re.compile(r'^\{?([\da-f]{8}-[\da-f]{4}-[\da-f]{4}-[\da-f]{4}-[\da-f]{12})\}?$')
 
-
 class SharePointLists(object):
     def __init__(self, opener):
         self.opener = opener
@@ -28,11 +27,11 @@ def all_lists(self):
         if not hasattr(self, '_all_lists'):
             xml = SP.GetListCollection()
             result = self.opener.post_soap(LIST_WEBSERVICE, xml)
-    
+
             self._all_lists = []
             for list_element in result.xpath('sp:GetListCollectionResult/sp:Lists/sp:List', namespaces=namespaces):
                 self._all_lists.append(SharePointList(self.opener, self, list_element))
-            
+
             # Explicitly request information about the UserInfo list.
             # This can be accessed with the name "User Information List"
             result = self.opener.post_soap(LIST_WEBSERVICE, SP.GetList(SP.listName("UserInfo")))
@@ -84,7 +83,7 @@ def __getitem__(self, key):
                 if list_object.id == key:
                     return list_object
             raise KeyError('No list with ID {0}'.format(key))
-        elif isinstance(key, str):
+        elif isinstance(key, basestring):
             for list_object in self.all_lists:
                 if list_object.meta['Title'] == key:
                     return list_object
@@ -136,7 +135,7 @@ def settings(self):
             response = self.opener.post_soap(LIST_WEBSERVICE, xml)
             self._settings = response[0][0]
         return self._settings
-    
+
     @property
     def moderation(self):
         if self._meta['EnableModeration'] != 'True':
@@ -249,7 +248,7 @@ def append(self, row):
         self.rows  # Make sure self._rows exists.
         self._rows.append(row)
         return row
-    
+
     def append_from(self, other_list):
         for row in other_list.rows:
             self.append(row.as_row(self.Row))
@@ -437,6 +436,28 @@ def open(self):
         request.add_header('Translate', 'f')
         return self.opener.open(request)
 
+    def approve(self, approved=True):
+        if not self.WorkflowInstanceID:
+            raise AttributeError('Not a workflow task')
+        else:
+            if approved:
+                taskstatus = 'Approved'
+            else:
+                taskstatus = 'Rejected'
+            xml = SPW.AlterToDo(SPW.item(self.ServerUrl),
+                            SPW.todoId(str(self.id)),
+                            SPW.todoListId(self.list.id),
+                            SPW.taskData(
+                                MY.myFields(
+                                    MY.TaskStatus(taskstatus),
+                                    MY.Status('Completed'),
+                                    MY.Completed('1'))))
+            result = self.list.opener.post_soap('_vti_bin/workflow.asmx', xml,
+                                    soapaction="http://schemas.microsoft.com/sharepoint/soap/workflow/AlterToDo")
+
+    def reject(self):
+        self.approve(approved=False)
+
     @property
     def attachments(self):
         if not hasattr(self, '_attachments'):
diff --git a/sharepoint/xml.py b/sharepoint/xml.py
index f98b082..10a31f6 100644
--- a/sharepoint/xml.py
+++ b/sharepoint/xml.py
@@ -1,11 +1,13 @@
 from lxml import builder
 
 namespaces = {
+    'my': "http://schemas.microsoft.com/office/infopath/2003/myXSD",
     'xs': 'http://www.w3.org/2001/XMLSchema',
     'wsdl': 'http://schemas.xmlsoap.org/wsdl/',
     'soap': 'http://schemas.xmlsoap.org/soap/envelope/',
     't': 'http://schemas.microsoft.com/exchange/services/2006/types',
     'sp': 'http://schemas.microsoft.com/sharepoint/soap/',
+    'spw': 'http://schemas.microsoft.com/sharepoint/soap/workflow/',
     'spd': 'http://schemas.microsoft.com/sharepoint/soap/directory/',
     'rs': 'urn:schemas-microsoft-com:rowset',
     'ups': 'http://microsoft.com/webservices/SharePointPortalServer/UserProfileService/GetUserProfileByIndex',
@@ -19,9 +21,11 @@
     'sharepoint': 'https://github.com/ox-it/python-sharepoint/',  # Ours
 }
 
+MY = builder.ElementMaker(namespace=namespaces['my'], nsmap=namespaces)
 SOAP = builder.ElementMaker(namespace=namespaces['soap'], nsmap=namespaces)
 T = builder.ElementMaker(namespace=namespaces['t'], nsmap=namespaces)
 SP = builder.ElementMaker(namespace=namespaces['sp'], nsmap=namespaces)
+SPW = builder.ElementMaker(namespace=namespaces['spw'], nsmap=namespaces)
 SPD = builder.ElementMaker(namespace=namespaces['spd'], nsmap=namespaces)
 UPS = builder.ElementMaker(namespace=namespaces['ups'], nsmap=namespaces)