diff --git a/project_assignees/__manifest__.py b/project_assignees/__manifest__.py
index 3e56d90..ad0f75f 100644
--- a/project_assignees/__manifest__.py
+++ b/project_assignees/__manifest__.py
@@ -78,6 +78,7 @@ This module is maintained by Elabore.
     },
     # always loaded
     "data": [
+        "data/project_assignees_data.xml",
         "views/project_task.xml",
         "views/portal_template.xml",
     ],
diff --git a/project_assignees/data/project_assignees_data.xml b/project_assignees/data/project_assignees_data.xml
new file mode 100644
index 0000000..0366ddc
--- /dev/null
+++ b/project_assignees/data/project_assignees_data.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data noupdate="1">
+        <record id="mt_task_assignees" model="mail.message.subtype">
+            <field name="name">Assignees change</field>
+            <field name="res_model">project.task</field>
+            <field name="default" eval="False"/>
+            <field name="description">Assignees changed</field>
+        </record>
+
+        <record id="mt_project_task_assignees" model="mail.message.subtype">
+            <field name="name">Task Assignees Changed</field>
+            <field name="sequence">13</field>
+            <field name="res_model">project.project</field>
+            <field name="default" eval="False"/>
+            <field name="parent_id" eval="ref('mt_task_assignees')"/>
+            <field name="relation_field">project_id</field>
+        </record>
+    </data>
+
+    <!-- Template email user assigned to a task -->
+    <data>
+        <template id="message_user_assigned">
+            <p style="margin: 0px;">
+                <span>Dear <t t-esc="partner_name"/>,</span><br />
+                <span style="margin-top: 8px;">You have been assigned to the <t t-esc="model_description or 'document'"/> <t t-esc="object.name_get()[0][1]"/>.</span>
+            </p>
+            <p style="margin-top: 24px; margin-bottom: 16px;">
+                <a t-att-href="'/mail/view?model=%s&amp;res_id=%s' % (object._name, object.id)" style="background-color:#875A7B; padding: 10px; text-decoration: none; color: #fff; border-radius: 5px;">
+                        View <t t-esc="model_description or 'document'"/>
+                </a>
+            </p>
+        </template>
+    </data>
+</odoo>
\ No newline at end of file
diff --git a/project_assignees/i18n/fr.po b/project_assignees/i18n/fr.po
index 92a4f33..1e2f428 100644
--- a/project_assignees/i18n/fr.po
+++ b/project_assignees/i18n/fr.po
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Server 12.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2022-08-25 15:14+0000\n"
-"PO-Revision-Date: 2022-08-25 15:14+0000\n"
+"POT-Creation-Date: 2023-04-12 11:37+0000\n"
+"PO-Revision-Date: 2023-04-12 11:37+0000\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -18,15 +18,66 @@ msgstr ""
 #. module: project_assignees
 #: model_terms:ir.ui.view,arch_db:project_assignees.portal_my_task_assignees
 msgid "<strong>Other assignees</strong>"
-msgstr "<strong>Autres intervenants</strong>"
+msgstr "<strong>Assigné à</strong>"
+
+#. module: project_assignees
+#: model:mail.message.subtype,name:project_assignees.mt_task_assignees
+msgid "Assignees change"
+msgstr "Changement d'assignation"
+
+#. module: project_assignees
+#: model:mail.message.subtype,description:project_assignees.mt_task_assignees
+msgid "Assignees changed"
+msgstr "Changement d'assignation"
+
+#. module: project_assignees
+#: model_terms:ir.ui.view,arch_db:project_assignees.portal_my_task_assignees
+msgid "Contact"
+msgstr ""
+
+#. module: project_assignees
+#: model_terms:ir.ui.view,arch_db:project_assignees.message_user_assigned
+msgid "Dear"
+msgstr "Cher"
+
+#. module: project_assignees
+#: model:ir.model,name:project_assignees.model_mail_thread
+msgid "Email Thread"
+msgstr "Discussion par courriel"
+
+#. module: project_assignees
+#: model:ir.model,name:project_assignees.model_mail_tracking_value
+msgid "Mail Tracking Value"
+msgstr "Valeur de suivi des courriers"
 
 #. module: project_assignees
 #: model:ir.model.fields,field_description:project_assignees.field_project_task__assignee_ids
 msgid "Other Assignees"
-msgstr "Autres intervenants"
+msgstr "Assigné à"
 
 #. module: project_assignees
 #: model:ir.model,name:project_assignees.model_project_task
 msgid "Task"
 msgstr "Tâche"
 
+#. module: project_assignees
+#: model:mail.message.subtype,name:project_assignees.mt_project_task_assignees
+msgid "Task Assignees Changed"
+msgstr "Changement d'assignation pour la tâche"
+
+#. module: project_assignees
+#: model_terms:ir.ui.view,arch_db:project_assignees.message_user_assigned
+msgid "View"
+msgstr "Vue"
+
+#. module: project_assignees
+#: code:addons/project_assignees/models/project_task.py:57
+#, python-format
+msgid "You have been assigned to %s"
+msgstr ""
+
+#. module: project_assignees
+#: model_terms:ir.ui.view,arch_db:project_assignees.message_user_assigned
+msgid "You have been assigned to the"
+msgstr "Vous avez été assigné à "
+
diff --git a/project_assignees/models/project_task.py b/project_assignees/models/project_task.py
index 88909c7..1a71eb1 100644
--- a/project_assignees/models/project_task.py
+++ b/project_assignees/models/project_task.py
@@ -1,26 +1,99 @@
 
 from odoo import models, fields, _, api
 
+        
+
+
+class MailTracking(models.Model):
+    _inherit = 'mail.tracking.value'
+
+    @api.model
+    def create_tracking_values(self, initial_value, new_value, col_name, col_info, track_sequence):
+        """
+        Track values of assignees changes in chatter
+        """
+        if col_name == 'assignee_ids' and initial_value:
+            values = {'field': col_name, 'field_desc': col_info['string'], 'field_type': col_info['type'], 'track_sequence': track_sequence}
+            values.update({
+                'old_value_char': ', '.join([i.name for i in initial_value]),
+                'new_value_char': ', '.join([i.name for i in new_value])
+            })
+            return values
+        return super(MailTracking, self).create_tracking_values(initial_value, new_value, col_name, col_info, track_sequence)
 
 class Task(models.Model):
     _inherit = "project.task"
 
-    assignee_ids = fields.Many2many('res.users', 'assignee_ids_rel', string='Other Assignees')
+    assignee_ids = fields.Many2many('res.users', 'assignee_ids_rel', string='Other Assignees', track_visibility='change')
 
     @api.multi
-    def subscribe_assignees(self):
+    def subscribe_and_notify_assignees(self, new_assignee_ids=None):
         for task in self:
-            partner_ids = [a.partner_id.id for a in task.assignee_ids]
+            # Use assignees on parameter if exists
+            if new_assignee_ids:
+                assignees = self.env['res.users'].browse(new_assignee_ids)
+            else:
+                assignees = task.assignee_ids
+
+            # Subscribe partners
+            partner_ids = [a.partner_id.id for a in assignees]            
             task.message_subscribe(partner_ids)
+            
+            # Send notification to assignees
+            view = self.env['ir.ui.view'].browse(self.env['ir.model.data'].xmlid_to_res_id('project_assignees.message_user_assigned'))
+            model_description = self.env['ir.model']._get(task._name).display_name
+            
+            for assignee in assignees:
+                values = {
+                    'object': task,
+                    'model_description': model_description,
+                    'partner_name':assignee.name_get()[0][1]
+                }
+                assignation_msg = view.render(values, engine='ir.qweb', minimal_qcontext=True)
+                assignation_msg = self.env['mail.thread']._replace_local_links(assignation_msg)
+
+                
+                task.message_notify(
+                    subject=_('You have been assigned to %s') % task.display_name,
+                    body=assignation_msg,
+                    partner_ids=[(4, assignee.partner_id.id)],
+                    record_name=task.display_name,
+                    notif_layout='mail.mail_notification_light',
+                    model_description=model_description,
+                )
+
+
 
     @api.multi
     def write(self, vals):
+        # Notify only new assignees
+        if 'assignee_ids' in vals:
+            new_assignee_ids = vals['assignee_ids'][0][2].copy()               
+            for a in self.assignee_ids:
+                if a.id in new_assignee_ids:
+                    new_assignee_ids.remove(a.id)
+            self.subscribe_and_notify_assignees(new_assignee_ids)
+        
         result = super(Task, self).write(vals)
-        self.subscribe_assignees()
+        
         return result
     
     @api.model
     def create(self, vals):
         task = super(Task, self).create(vals)
-        task.subscribe_assignees()
-        return task
\ No newline at end of file
+        task.subscribe_and_notify_assignees()
+        return task
+    
+    
+    @api.multi
+    def _track_subtype(self, init_values):
+        self.ensure_one()
+        # keep notification of new task when creating a new task
+        res = super(Task, self)._track_subtype(init_values)
+        if res == 'project.mt_task_new':
+            return res
+        # if assignees change, notify it
+        if 'assignee_ids' in init_values:
+            return 'project_assignees.mt_task_assignees'
+        
+        return super(Task, self)._track_subtype(init_values)
\ No newline at end of file