diff --git a/addons/project/project.py b/addons/project/project.py
index 5c234cf5e26..8688f4ebc9b 100644
--- a/addons/project/project.py
+++ b/addons/project/project.py
@@ -920,21 +920,24 @@ class task(osv.osv):
             self.log(cr, uid, id, message)
         return True
 
-    def set_remaining_time_1(self, cr, uid, ids, context=None):
-        self.write(cr, uid, ids, {'remaining_hours': 1.0}, context=context)
+    def set_remaining_time(self, cr, uid, ids, remaining_time=1.0, context=None):
+        for task in self.browse(cr, uid, ids, context=context):
+            if (task.state=='draft') or (task.planned_hours==0.0):
+                self.write(cr, uid, [task.id], {'planned_hours': remaining_time}, context=context)
+        self.write(cr, uid, ids, {'remaining_hours': remaining_time}, context=context)
         return True
 
+    def set_remaining_time_1(self, cr, uid, ids, context=None):
+        return self.set_remaining_time(cr, uid, ids, 1.0, context)
+
     def set_remaining_time_2(self, cr, uid, ids, context=None):
-        self.write(cr, uid, ids, {'remaining_hours': 2.0}, context=context)
-        return True
+        return self.set_remaining_time(cr, uid, ids, 2.0, context)
 
     def set_remaining_time_5(self, cr, uid, ids, context=None):
-        self.write(cr, uid, ids, {'remaining_hours': 5.0}, context=context)
-        return True
+        return self.set_remaining_time(cr, uid, ids, 5.0, context)
 
     def set_remaining_time_10(self, cr, uid, ids, context=None):
-        self.write(cr, uid, ids, {'remaining_hours': 10.0}, context=context)
-        return True
+        return self.set_remaining_time(cr, uid, ids, 10.0, context)
 
     def set_kanban_state_blocked(self, cr, uid, ids, context=None):
         self.write(cr, uid, ids, {'kanban_state': 'blocked'}, context=context)
@@ -979,6 +982,7 @@ class task(osv.osv):
             self.pool.get('project.task.history').create(cr, uid, {
                 'task_id': task.id,
                 'remaining_hours': task.remaining_hours,
+                'planned_hours': task.planned_hours,
                 'kanban_state': task.kanban_state,
                 'type_id': task.type_id.id,
                 'state': task.state,
@@ -1158,7 +1162,8 @@ class project_task_history(osv.osv):
         'end_date': fields.function(_get_date, string='End Date', type="date", store={
             'project.task.history': (_get_related_date, None, 20)
         }),
-        'remaining_hours': fields.float('Remaining Hours', digits=(16,2)),
+        'remaining_hours': fields.float('Remaining Time', digits=(16,2)),
+        'planned_hours': fields.float('Planned Time', digits=(16,2)),
         'user_id': fields.many2one('res.users', 'Responsible'),
     }
     _defaults = {
@@ -1186,7 +1191,7 @@ class project_task_history_cumulative(osv.osv):
                     id as history_id,
                     date+generate_series(0, CAST((coalesce(end_date,DATE 'tomorrow')::date - date)AS integer)-1) as date,
                     task_id, type_id, user_id, kanban_state, state,
-                    remaining_hours
+                    remaining_hours, planned_hours
                 FROM
                     project_task_history
             ) as history
diff --git a/addons/project/project_view.xml b/addons/project/project_view.xml
index 0da6b2e247e..9e58946bf73 100644
--- a/addons/project/project_view.xml
+++ b/addons/project/project_view.xml
@@ -378,6 +378,7 @@
                                                         type="object" class="oe_kanban_button"><t t-esc="time[0]"/></a
                                                     ><b t-if="time[1]" class="oe_kanban_button oe_kanban_button_active"><t t-esc="Math.round(hours)"/></b
                                                 ></t>
+                                                <a name="do_open" states="draft" string="Open and validate estimated time" type="object" icon="kanban-apply"/>
                                             </span>
                                         </div>
                                         <div class="oe_kanban_clear"/>
diff --git a/addons/project/report/project_cumulative.xml b/addons/project/report/project_cumulative.xml
index aff90aea94e..89667992f0a 100644
--- a/addons/project/report/project_cumulative.xml
+++ b/addons/project/report/project_cumulative.xml
@@ -25,6 +25,18 @@
             <field name="type">graph</field>
             <field name="arch" type="xml">
                 <graph string="Project Tasks" type="bar">
+                    <field name="date"/>
+                    <field name="planned_hours" operator="+"/>
+                    <field name="type_id" group="True"/>
+                </graph>
+            </field>
+        </record>
+        <record id="view_task_history_burndown_graph" model="ir.ui.view">
+            <field name="name">project.task.history.burndown.graph</field>
+            <field name="model">project.task.history.burndown</field>
+            <field name="type">graph</field>
+            <field name="arch" type="xml">
+                <graph string="Burndown Chart of Tasks" type="bar">
                     <field name="date"/>
                     <field name="remaining_hours" operator="+"/>
                     <field name="type_id" group="True"/>
@@ -32,12 +44,13 @@
             </field>
         </record>
 
+
         <record id="view_task_history_search" model="ir.ui.view">
             <field name="name">project.task.history.cumulative.search</field>
             <field name="model">project.task.history.cumulative</field>
             <field name="type">search</field>
             <field name="arch" type="xml">
-               <search string="Task's Cumulative Flow">
+               <search string="Task's Analysis">
                     <group>
                         <filter name="open" string="In Progress" domain="[('state','in',('open','draft'))]" help="In Progress Tasks" icon="terp-camera_test"/>
                         <filter string="Pending" domain="[('state','=','pending')]" context="{'show_delegated':False}" help="Pending Tasks" icon="terp-gtk-media-pause"/>
@@ -69,13 +82,28 @@
             <field name="res_model">project.task.history.cumulative</field>
             <field name="view_type">form</field>
             <field name="view_mode">graph,tree</field>
+            <field name="view_id" ref="view_task_history_graph"/>
             <field eval="False" name="filter"/>
-            <field name="context">{"search_default_open":1, "search_default_this_month": 1}</field>
+            <field name="context">{"search_default_open":1, "search_default_this_month": 1, "search_default_project_id": project_id}</field>
         </record>
         <menuitem action="action_view_task_history_cumulative"
             id="menu_action_view_task_history_cumulative"
             parent="project_report_task" />
 
 
+        <record id="action_view_task_history_burndown" model="ir.actions.act_window">
+            <field name="name">Burndown Chart</field>
+            <field name="res_model">project.task.history.cumulative</field>
+            <field name="view_type">form</field>
+            <field name="view_mode">graph,tree</field>
+            <field name="view_id" ref="view_task_history_burndown_graph"/>
+            <field eval="False" name="filter"/>
+            <field name="context">{"search_default_open":1, "search_default_this_month": 1, "search_default_project_id": project_id}</field>
+        </record>
+        <menuitem action="action_view_task_history_burndown"
+            id="menu_action_view_task_history_burndown"
+            parent="project_report_task" />
+
+
     </data>
 </openerp>