diff --git a/__manifest__.py b/__manifest__.py
index e0005ad..b90a5f8 100644
--- a/__manifest__.py
+++ b/__manifest__.py
@@ -17,6 +17,9 @@
     ],    
     'installable': True,
     'assets': {
+        'web.assets_backend': [
+            'open_workshop/static/src/css/category_color.css',
+        ],
         'point_of_sale._assets_pos': [
 
             'open_workshop/static/src/js/product_screen_template_patch.js',
diff --git a/models/ows_models.py b/models/ows_models.py
index 05d6380..9f9786f 100644
--- a/models/ows_models.py
+++ b/models/ows_models.py
@@ -437,13 +437,34 @@ class OwsMachine(models.Model):
 
     name = fields.Char(required=True, translate=True)
     code = fields.Char(required=True, help="Eindeutiger Kurzcode, z.B. 'lasercutter'")
+    category = fields.Selection([
+        ('green', 'Kategorie 1: grün'),
+        ('yellow', 'Kategorie 2: gelb'),
+        ('red', 'Kategorie 3: rot'),
+    ], string="Sicherheitskategorie", required=True, default='red', help="Sicherheitsrelevante Maschinenkategorie:\n"
+            "- grün: keine Einweisungspflicht\n"
+            "- gelb: empfohlene Einweisung\n"
+            "- rot: Einweisung zwingend erforderlich")
+
+    category_icon = fields.Char(string="Kategorie-Symbol", compute="_compute_category_icon", store=False)
+
+    @api.depends('category')
+    def _compute_category_icon(self):
+        for rec in self:
+            icon_map = {
+                'green': '🟢',
+                'yellow': '🟡',
+                'red': '🔴',
+            }
+            rec.category_icon = icon_map.get(rec.category, '⚪')
+
     description = fields.Text()
     active = fields.Boolean(default=True)
-    area_id = fields.Many2one('ows.machine.area', string='Bereich')
+    area_id = fields.Many2one('ows.machine.area', string='Bereich', help="Bereich, in dem die Maschine oder das Gerät steht.")
     product_ids = fields.One2many('ows.machine.product', 'machine_id', string="Nutzungsprodukte")
-    product_names = fields.Char(string="Nutzungsprodukte Liste", compute="_compute_product_using_names", store=False,)
+    product_names = fields.Char(string="Liste der Nutzungsprodukte", compute="_compute_product_using_names", store=False,)
     training_ids = fields.One2many('ows.machine.training', 'machine_id', string="Einweisungsprodukte")
-    training_names = fields.Char(string="Einweisungsprodukte Liste", compute="_compute_product_training_names", store=False,)
+    training_names = fields.Char(string="Liste der Einweisungsprodukte", compute="_compute_product_training_names", store=False,)
 
     @api.depends('product_ids.product_id.name')
     def _compute_product_using_names(self):
@@ -493,7 +514,7 @@ class OwsMachine(models.Model):
 
         access_by_area = []
         for area in areas:
-            machines = self.search([('area_id', '=', area.id)], order="name")
+            machines = self.search([('area_id', '=', area.id),  ('category', '=', 'red')], order="name")
             machine_list = []
             for machine in machines:
                 has_access = bool(self.env['ows.machine.access'].search([
diff --git a/static/src/css/category_color.css b/static/src/css/category_color.css
new file mode 100644
index 0000000..154419d
--- /dev/null
+++ b/static/src/css/category_color.css
@@ -0,0 +1,9 @@
+.category-color-circle {
+    display: inline-block;
+    width: 14px;
+    height: 14px;
+    border-radius: 50%;
+    margin-left: 8px;
+    vertical-align: middle;
+    border: 1px solid #444;
+}
diff --git a/views/machine_views.xml b/views/machine_views.xml
index 287c759..e2d87ff 100644
--- a/views/machine_views.xml
+++ b/views/machine_views.xml
@@ -6,30 +6,35 @@
     <field name="model">ows.machine</field>
     <field name="arch" type="xml">
       <tree>
+        <field name="category_icon" string="⚙" readonly="1"/>
         <field name="name"/>
+        <field name="category"/>
         <field name="code"/>
         <field name="area_id" widget="many2one_color"/>
         <field name="product_names"/> 
         <field name="training_names"/> 
         <field name="active"/>
+
       </tree>
     </field>
   </record>
 
   <!-- Maschinen Formularansicht -->
-<record id="view_machine_form" model="ir.ui.view">
-  <field name="name">ows.machine.form</field>
-  <field name="model">ows.machine</field>
-  <field name="arch" type="xml">
-    <form string="Maschine">
-      <sheet>
-        <group>
-          <field name="name"/>
-          <field name="code"/>
-          <field name="area_id"/>
-          <field name="description"/>
-          <field name="active"/>
-        </group>
+  <record id="view_machine_form" model="ir.ui.view">
+    <field name="name">ows.machine.form</field>
+    <field name="model">ows.machine</field>
+    <field name="arch" type="xml">
+      <form string="Maschine">
+        <sheet>
+          <group>
+            <field name="category_icon" string="⚙" readonly="1"/>
+            <field name="name"/>
+            <field name="category"/>
+            <field name="code"/>
+            <field name="area_id"/>
+            <field name="description"/>
+            <field name="active"/>
+          </group>
 
         <!-- Neue  -->
         <notebook>