diff --git a/__init__.py b/__init__.py
index 7101a02..b21e6e1 100644
--- a/__init__.py
+++ b/__init__.py
@@ -1,6 +1,6 @@
 from trytond.pool import Pool
 from . import (address, party, product, purchase, sale,
-               equipment, configuration_equipment,  subscription)
+               equipment, configuration_equipment, maintenance, subscription)
 
 def register():
     Pool.register(
@@ -14,6 +14,7 @@ def register():
         sale.CreateSubscriptionStart,
         equipment.OpticalEquipment,
         configuration_equipment.Configuration,
+        maintenance.Maintenance,
         subscription.Subscription,
         subscription.SubscriptionEquipment,
         module='optical_equipment', type_='model')
diff --git a/equipment.xml b/equipment.xml
index 4528483..0e2edd7 100644
--- a/equipment.xml
+++ b/equipment.xml
@@ -15,11 +15,6 @@
             name="Equipment"
             sequence="40"
             id="menu_equipment"/>
-	<!--
-	<record model="ir.action.act_window" id="act_optical_equipment">
-	    <field name="name">Equipments</field>
-	    <field name="res_model">optical_equipment.equipment</field>
-	</record> -->
 	<record model="ir.action.act_window" id="act_optical_equipment_form">
 	    <field name="name">Equipments</field>
 	    <field name="res_model">optical_equipment.equipment</field>
@@ -90,7 +85,7 @@
 	</record>
 	<menuitem parent="menu_equipment"
 		  action="act_optical_equipment_form"
-		  sequence="10"
+		  sequence="20"
 		  id="menu_optical_equipment_form"/>
 	
 	<record model="ir.ui.menu-res.group"
diff --git a/maintenance.py b/maintenance.py
index 65e1a37..dfb9c44 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -1,8 +1,67 @@
 from trytond.model import (
     Workflow, ModelSQL, ModelView, Unique, fields)
+from trytond.transaction  import Transaction
+from trytond.pyson import Eval
 
 class Maintenance(Workflow, ModelSQL, ModelView):
     'Equipment Maintenance'
     __name__ = 'optical_equipment.maintenance'
 
+    code = fields.Char(
+        "Code", select=True,states={'readonly': True })
     
+    state = fields.Selection([
+             ('draft', "Draft"),
+             ('agended', "Agended"),
+             ('in_progress', "In Progress")
+             ], "State",required=True, readonly=True, sort=False)
+
+    company = fields.Many2One('company.company', "Company", readonly=True)
+    propietary = fields.Many2One('party.party', "Propietary")
+    propietary_address = fields.Many2One('party.address', "Propietary Address", required=True,
+                                         domain=[('party', '=', Eval('propietary'))]
+                                         )
+
+    @classmethod
+    def __setup__(cls):
+        super(Maintenance, cls).__setup__()
+        cls._transitions.update({ 
+            ('draft', 'agended'),
+            ('agended', 'in_progress'),
+            ('in_progress', 'finished')
+            })
+        cls._buttons.update({
+                'draft': {},
+                'agended': {},
+                'in_progress': {},
+                'finished': {},
+                })
+
+    @staticmethod
+    def default_company():
+        return Transaction().context.get('company')
+
+    
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('draft')
+    def draft(cls, maintenances):
+        pass
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('agended')
+    def agended(cls, maintenances):
+        pass
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('in_progress')
+    def inProgress(cls, maintenances):
+        pass
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('finished')
+    def finished(cls, maintenances):
+        pass
diff --git a/maintenance.xml b/maintenance.xml
new file mode 100644
index 0000000..3dc7df3
--- /dev/null
+++ b/maintenance.xml
@@ -0,0 +1,98 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+     this repository contains the full copyright notices and license terms. -->
+<tryton>
+    <data>
+	<record model="ir.action.act_window" id="act_maintenance_form">
+	    <field name="name">Maintenances</field>
+	    <field name="res_model">optical_equipment.maintenance</field>
+	    <field name="search_value"></field>
+	</record>
+	<record model="ir.ui.view" id= "maintenance_view_tree">
+	    <field name="model">optical_equipment.maintenance</field>
+	    <field name="type">tree</field>
+	    <field name="name">maintenance_tree</field>
+	</record>
+	<record model="ir.ui.view" id= "maintenance_view_form">
+	    <field name="model">optical_equipment.maintenance</field>
+	    <field name="type">form</field>
+	    <field name="name">maintenance_form</field>
+	</record>
+	<record model="ir.action.act_window.view" id="act_maintenance_view1">
+            <field name="sequence" eval="10"/>
+	    <field name="view" ref="maintenance_view_tree"/>
+            <field name="act_window" ref="act_maintenance_form"/>
+	</record>
+	<record model="ir.action.act_window.view" id="act_maintenance_view2">
+            <field name="sequence" eval="20"/>
+	    <field name="view" ref="maintenance_view_form"/>
+            <field name="act_window" ref="act_maintenance_form"/>
+	</record>
+	<record model="ir.action.act_window.domain" id="act_maintenance_form_domain_draft">
+             <field name="name">Draft</field>
+            <field name="sequence" eval="10"/>
+            <field name="domain"
+                eval="[('state', '=', 'draft')]"
+                pyson="1"/>
+            <field name="count" eval="True"/>
+            <field name="act_window" ref="act_maintenance_form"/>
+        </record>
+        <record model="ir.action.act_window.domain" id="act_maintenance_form_domain_agended">
+            <field name="name">Agended</field>
+            <field name="sequence" eval="20"/>
+            <field name="domain"
+                eval="[('state', '=', 'agended')]"
+                pyson="1"/>
+            <field name="count" eval="True"/>
+            <field name="act_window" ref="act_maintenance_form"/>
+        </record>
+        <record model="ir.action.act_window.domain" id="act_maintenance_form_domain_in_progress">
+            <field name="name">In progress</field>
+            <field name="sequence" eval="30"/>
+            <field name="domain"
+                eval="[('state', '=', 'in_progress')]"
+                pyson="1"/>
+            <field name="count" eval="True"/>
+            <field name="act_window" ref="act_maintenance_form"/>
+        </record>
+	<record model="ir.action.act_window.domain" id="act_maintenance_form_domain_finished">
+            <field name="name">Finished</field>
+            <field name="sequence" eval="30"/>
+            <field name="domain"
+                eval="[('state', '=', 'finished')]"
+                pyson="1"/>
+            <field name="count" eval="True"/>
+            <field name="act_window" ref="act_maintenance_form"/>
+        </record>
+        <record model="ir.action.act_window.domain" id="act_maintenance_form_domain_all">
+            <field name="name">All</field>
+            <field name="sequence" eval="9999"/>
+            <field name="domain"></field>
+            <field name="act_window" ref="act_maintenance_form"/>
+        </record>
+	<record model="ir.model.button" id="maintenance_draft_button">
+	    <field name="name">draft</field>
+	    <field name="string">Draft</field>
+	    <field name="model" search="[('model', '=', 'optical_equipment.maintenance')]"/>
+	</record>
+	<record model="ir.model.button" id="maintenance_agended_button">
+	    <field name="name">agended</field>
+	    <field name="string">Agended</field>
+	    <field name="model" search="[('model', '=', 'optical_equipment.maintenance')]"/>
+	</record>
+	<record model="ir.model.button" id="maintenance_in_progress_button">
+	    <field name="name">in_progress</field>
+	    <field name="string">In progress</field>
+	    <field name="model" search="[('model', '=', 'optical_equipment.maintenance')]"/>
+	</record>
+	<record model="ir.model.button" id="maintenance_finished_button">
+	    <field name="name">finished</field>
+	    <field name="string">Finished</field>
+	    <field name="model" search="[('model', '=', 'optical_equipment.maintenance')]"/>
+	</record>
+	<menuitem parent="menu_equipment"
+		  action="act_maintenance_form"
+		  sequence="30"
+		  id="menu_maintenance_form"/>
+    </data>
+</tryton>
diff --git a/tryton.cfg b/tryton.cfg
index 80f7e34..02795fc 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -20,5 +20,6 @@ xml:
     sale.xml
     purchase.xml
     uom.xml
+    maintenance.xml
     subscription.xml
     message.xml
\ No newline at end of file
diff --git a/view/maintenance_form.xml b/view/maintenance_form.xml
new file mode 100644
index 0000000..2b6bc20
--- /dev/null
+++ b/view/maintenance_form.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0"?> 
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+     this repository contains the full copyright notices and license terms. -->
+<form>
+    <label name="code"/>
+    <field name="code"/>
+    <label name="company"/>
+    <field name="company"/>
+    <label name="propietary"/>
+    <field name="propietary"/>
+    <label name="propietary_address"/>
+    <field name="propietary_address"/>
+    <label name="equipment"/>
+    <field name="equipment"/>
+    <label name="state"/>
+    <field name="state"/>
+   <group col="2" colspan="2" id="button">
+      <button name="draf"/>
+      <button name="agended"/>
+      <button name="in_progress"/>
+      <button name="finished"/>
+   </group>
+</form>
diff --git a/view/maintenance_tree.xml b/view/maintenance_tree.xml
new file mode 100644
index 0000000..591cc80
--- /dev/null
+++ b/view/maintenance_tree.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0"?> 
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+     this repository contains the full copyright notices and license terms.-->
+<tree>
+    <field name="code"/>
+    <field name="company"/>
+    <field name="location"/>
+    <field name="propietary"/>
+    <field name="propietary_address"/>
+    <field name="equipment"/>
+</tree>