diff --git a/__init__.py b/__init__.py
index bbe78bf..f5066d6 100644
--- a/__init__.py
+++ b/__init__.py
@@ -15,7 +15,7 @@ def register():
         user.User,
         pending_call.PendingCall,
         call.Call,
-        call.Task,
+        call.PendingTask,
         department.Department,
         city.City,
         prospect.ContactMethod,
diff --git a/call.py b/call.py
index 3a876db..783d8c9 100644
--- a/call.py
+++ b/call.py
@@ -1,7 +1,6 @@
 from trytond.model import ModelSQL, ModelView, fields
+from trytond.pyson import Eval
 from datetime import date
-
-
 from .selections.interest import Interest
 from .selections.call_types import CallTypes
 from .selections.call_results import CallResults
@@ -49,16 +48,36 @@ class Call(ModelSQL, ModelView):
         return date.today()
 
 
-class Task(ModelSQL, ModelView):
-    'Tarea pendiente a un seguimiento de prospecto'
+class PendingTask(ModelSQL, ModelView):
+    'Tarea a realizar a un seguimiento de prospecto'
     __name__ = "sale.pending_task"
 
     description = fields.Text('Description', required=True)
-    done = fields.Boolean('Done')
+    state = fields.Selection(
+        [('pending', 'Pending'),
+        ('done', 'Done')],
+        'State')
+
     prospect_trace = fields.Many2One(
         'sale.prospect_trace', 'Prospect trace',
         required=True, readonly=True)
 
     @classmethod
-    def default_done(cls):
-        return False
+    def __setup__(cls):
+        super(PendingTask, cls).__setup__()
+        cls._buttons.update({
+            'close_task': {
+                'invisible': Eval('state') == 'done'
+                }
+            })
+
+    @classmethod
+    @ModelView.button
+    def close_task(cls, tasks):
+        for task in tasks:
+            task.state = 'done'
+            task.save()
+
+    @classmethod
+    def default_state(cls):
+        return 'pending'
diff --git a/call.xml b/call.xml
index 2f1caf1..8e5efc9 100644
--- a/call.xml
+++ b/call.xml
@@ -105,5 +105,10 @@ this repository contains the full copyright notices and license terms. -->
         id="menu_pending_tasks"
         action="act_pending_task_tree"
         icon="tryton-graph"/>
+    <record model="ir.model.button" id="close_task_button">
+        <field name="name">close_task</field>
+        <field name="string">Close task</field>
+        <field name="model" search="[('model', '=', 'sale.pending_task')]"/>
+    </record>
     </data>
 </tryton>
diff --git a/tests/scenario_sale_opportunity_management.rst b/tests/scenario_sale_opportunity_management.rst
index 4661577..646d3f1 100644
--- a/tests/scenario_sale_opportunity_management.rst
+++ b/tests/scenario_sale_opportunity_management.rst
@@ -282,6 +282,13 @@ Hacer llamada y programar tarea::
     >>> task
     proteus.Model.get('sale.pending_task')(1)
 
+    >>> task.state
+    'pending'
+
+    >>> task.click('close_task') 
+    >>> task.state
+    'done'
+
 Hacer llamada y cerrar venta (Seguimiento de prospecto)::
     >>> make_call = Wizard('sale.prospect_trace.make_call', [prospect_trace])
     >>> make_call.form.description = 'Closed sale'
diff --git a/view/pending_task_tree.xml b/view/pending_task_tree.xml
index 84c48ff..a947974 100644
--- a/view/pending_task_tree.xml
+++ b/view/pending_task_tree.xml
@@ -4,4 +4,5 @@ this repository contains the full copyright notices and license terms. -->
 <tree>
     <field name="prospect_trace" expand="1"/>
     <field name="description" expand="1"/>
+    <button name="close_task"/>
 </tree>
\ No newline at end of file