diff --git a/apps/activity/models.py b/apps/activity/models.py
index 29f04b39..cab229c4 100644
--- a/apps/activity/models.py
+++ b/apps/activity/models.py
@@ -139,7 +139,7 @@ class Entry(models.Model):
         verbose_name = _("entry")
         verbose_name_plural = _("entries")
 
-    def save(self, *args,**kwargs):
+    def save(self, *args, **kwargs):
 
         qs = Entry.objects.filter(~Q(pk=self.pk), activity=self.activity, note=self.note, guest=self.guest)
         if qs.exists():
@@ -153,7 +153,7 @@ class Entry(models.Model):
             if self.note.balance < 0:
                 raise ValidationError(_("The balance is negative."))
 
-        ret = super().save(*args,**kwargs)
+        ret = super().save(*args, **kwargs)
 
         if insert and self.guest:
             GuestTransaction.objects.create(
diff --git a/apps/activity/views.py b/apps/activity/views.py
index 14746929..12386bd1 100644
--- a/apps/activity/views.py
+++ b/apps/activity/views.py
@@ -45,8 +45,8 @@ class ActivityListView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTableView
         context['title'] = _("Activities")
 
         upcoming_activities = Activity.objects.filter(date_end__gt=datetime.now())
-        context['upcoming'] = ActivityTable(data=upcoming_activities
-                                        .filter(PermissionBackend.filter_queryset(self.request.user, Activity, "view")))
+        context['upcoming'] = ActivityTable(
+            data=upcoming_activities.filter(PermissionBackend.filter_queryset(self.request.user, Activity, "view")))
 
         return context
 
@@ -153,9 +153,9 @@ class ActivityEntryView(LoginRequiredMixin, TemplateView):
         context["title"] = _('Entry for activity "{}"').format(activity.name)
         context["noteuser_ctype"] = ContentType.objects.get_for_model(NoteUser).pk
         context["notespecial_ctype"] = ContentType.objects.get_for_model(NoteSpecial).pk
-        
+
         context["activities_open"] = Activity.objects.filter(open=True).filter(
             PermissionBackend.filter_queryset(self.request.user, Activity, "view")).filter(
             PermissionBackend.filter_queryset(self.request.user, Activity, "change")).all()
 
-        return context
\ No newline at end of file
+        return context
diff --git a/apps/treasury/views.py b/apps/treasury/views.py
index 7361d1d2..8d744443 100644
--- a/apps/treasury/views.py
+++ b/apps/treasury/views.py
@@ -203,9 +203,9 @@ class RemittanceCreateView(ProtectQuerysetMixin, LoginRequiredMixin, CreateView)
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
 
-        context["table"] = RemittanceTable(data=Remittance.objects
-                                       .filter(PermissionBackend.filter_queryset(self.request.user, Remittance, "view"))
-                                       .all())
+        context["table"] = RemittanceTable(
+            data=Remittance.objects.filter(
+                PermissionBackend.filter_queryset(self.request.user, Remittance, "view")).all())
         context["special_transactions"] = SpecialTransactionTable(data=SpecialTransaction.objects.none())
 
         return context
diff --git a/apps/wei/__init__.py b/apps/wei/__init__.py
new file mode 100644
index 00000000..ad360dae
--- /dev/null
+++ b/apps/wei/__init__.py
@@ -0,0 +1,4 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+default_app_config = 'wei.apps.WeiConfig'
diff --git a/apps/wei/admin.py b/apps/wei/admin.py
new file mode 100644
index 00000000..4e945ad5
--- /dev/null
+++ b/apps/wei/admin.py
@@ -0,0 +1,2 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
diff --git a/apps/wei/apps.py b/apps/wei/apps.py
new file mode 100644
index 00000000..f6332232
--- /dev/null
+++ b/apps/wei/apps.py
@@ -0,0 +1,11 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.apps import AppConfig
+from django.utils.translation import gettext_lazy as _
+
+
+class WeiConfig(AppConfig):
+    name = 'wei'
+    verbose_name = _('WEI')
+
diff --git a/apps/wei/migrations/__init__.py b/apps/wei/migrations/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/apps/wei/models.py b/apps/wei/models.py
new file mode 100644
index 00000000..910f8309
--- /dev/null
+++ b/apps/wei/models.py
@@ -0,0 +1,243 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.contrib.auth.models import User
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+from note.models import NoteSpecial
+
+
+class WEI(models.Model):
+    """
+    Store WEI information
+    """
+    name = models.CharField(
+        max_length=255,
+        unique=True,
+        verbose_name=_("name"),
+    )
+
+    year = models.PositiveIntegerField(
+        unique=True,
+        verbose_name=_("year"),
+    )
+
+    start = models.DateField(
+        verbose_name=_("start date"),
+    )
+
+    end = models.DateField(
+        verbose_name=_("end date"),
+    )
+
+    price_paid = models.PositiveIntegerField(
+        verbose_name=_("Price for paid students"),
+    )
+
+    price_unpaid = models.PositiveIntegerField(
+        verbose_name=_("Price for unpaid students"),
+    )
+
+    email = models.EmailField(
+        verbose_name=_("contact email"),
+    )
+
+    registrations_open = models.BooleanField(
+        verbose_name=_("registrations open"),
+    )
+
+    def __str__(self):
+        return self.name
+
+    class Meta:
+        verbose_name = _("WEI")
+        verbose_name_plural = _("WEI")
+
+
+class Bus(models.Model):
+    """
+    The best bus for the best WEI
+    """
+    wei = models.ForeignKey(
+        WEI,
+        on_delete=models.PROTECT,
+        related_name="buses",
+        verbose_name=_("WEI"),
+    )
+
+    name = models.CharField(
+        max_length=255,
+        verbose_name=_("name"),
+    )
+
+    def __str__(self):
+        return self.name
+
+    class Meta:
+        unique_together = ('wei', 'name',)
+
+
+class BusTeam(models.Model):
+    """
+    A bus has multiple teams
+    """
+    bus = models.ForeignKey(
+        Bus,
+        on_delete=models.CASCADE,
+        related_name="teams",
+        verbose_name=_("bus"),
+    )
+
+    name = models.CharField(
+        max_length=255,
+    )
+
+    color = models.PositiveIntegerField(  # Use a color picker to get the hexa code
+        verbose_name=_("color"),
+        help_text=_("The color of the T-Shirt, stored with its number equivalent"),
+    )
+
+    def __str__(self):
+        return self.name + " (" + str(self.bus) + ")"
+
+    class Meta:
+        unique_together = ('bus', 'name',)
+        verbose_name = _("Bus team")
+        verbose_name_plural = _("Bus teams")
+
+
+class WEIRole(models.Model):
+    """
+    A Role for the WEI can be bus chief, team chief, free electron, ...
+    """
+    name = models.CharField(
+        max_length=255,
+        unique=True,
+    )
+
+
+class WEIUser(models.Model):
+    """
+    Store personal data that can be useful for the WEI.
+    """
+
+    user = models.ForeignKey(
+        User,
+        on_delete=models.PROTECT,
+        related_name="wei",
+        verbose_name=_("user"),
+    )
+
+    wei = models.ForeignKey(
+        WEI,
+        on_delete=models.PROTECT,
+        related_name="users",
+        verbose_name=_("WEI"),
+    )
+
+    role = models.ForeignKey(
+        WEIRole,
+        on_delete=models.PROTECT,
+        verbose_name=_("role"),
+    )
+
+    birth_date = models.DateField(
+        verbose_name=_("birth date"),
+    )
+
+    gender = models.CharField(
+        max_length=16,
+        choices=(
+            ('male', _("Male")),
+            ('female', _("Female")),
+            ('nonbinary', _("Non binary")),
+        ),
+        verbose_name=_("gender"),
+    )
+
+    health_issues = models.TextField(
+        verbose_name=_("health issues"),
+    )
+
+    emergency_contact_name = models.CharField(
+        max_length=255,
+        verbose_name=_("emergency contact name"),
+    )
+
+    emergency_contact_phone = models.CharField(
+        max_length=32,
+        verbose_name=_("emergency contact phone"),
+    )
+
+    payment_method = models.ForeignKey(
+        NoteSpecial,
+        on_delete=models.PROTECT,
+        null=True,  # null = no credit, paid with note
+        related_name="+",
+        verbose_name=_("payment method"),
+    )
+
+    soge_credit = models.BooleanField(
+        verbose_name=_("Credit from Société générale"),
+    )
+
+    ml_events_registation = models.BooleanField(
+        verbose_name=_("Register on the mailing list to stay informed of the events of the campus (1 mail/week)"),
+    )
+
+    ml_sport_registation = models.BooleanField(
+        verbose_name=_("Register on the mailing list to stay informed of the sport events of the campus (1 mail/week)"),
+    )
+
+    ml_art_registation = models.BooleanField(
+        verbose_name=_("Register on the mailing list to stay informed of the art events of the campus (1 mail/week)"),
+    )
+
+    team = models.ForeignKey(
+        BusTeam,
+        on_delete=models.PROTECT,
+        related_name="users",
+        null=True,
+        blank=True,
+        verbose_name=_("team"),
+    )
+
+    bus_choice1 = models.ForeignKey(
+        Bus,
+        on_delete=models.PROTECT,
+        related_name="+",
+        verbose_name=_("bus choice 1"),
+    )
+
+    bus_choice2 = models.ForeignKey(
+        Bus,
+        on_delete=models.PROTECT,
+        related_name="+",
+        null=True,
+        blank=True,
+        verbose_name=_("bus choice 2"),
+    )
+
+    bus_choice3 = models.ForeignKey(
+        Bus,
+        on_delete=models.PROTECT,
+        related_name="+",
+        null=True,
+        blank=True,
+        verbose_name=_("bus choice 3"),
+    )
+
+    asked_roles = models.ManyToManyField(
+        WEIRole,
+        related_name="+",
+        verbose_name=_("asked roles"),
+    )
+
+    def __str__(self):
+        return str(self.user)
+
+    class Meta:
+        unique_together = ('user', 'wei',)
+        verbose_name = _("WEI User")
+        verbose_name_plural = _("WEI Users")
diff --git a/apps/wei/urls.py b/apps/wei/urls.py
new file mode 100644
index 00000000..afd1c566
--- /dev/null
+++ b/apps/wei/urls.py
@@ -0,0 +1,9 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.urls import path
+
+
+app_name = 'wei'
+urlpatterns = [
+]
diff --git a/apps/wei/views.py b/apps/wei/views.py
new file mode 100644
index 00000000..8b245779
--- /dev/null
+++ b/apps/wei/views.py
@@ -0,0 +1,5 @@
+# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.shortcuts import render
+
diff --git a/note_kfet/settings/base.py b/note_kfet/settings/base.py
index 283f8e56..5ed8b1d8 100644
--- a/note_kfet/settings/base.py
+++ b/note_kfet/settings/base.py
@@ -62,6 +62,7 @@ INSTALLED_APPS = [
     'permission',
     'registration',
     'treasury',
+    'wei',
 ]
 LOGIN_REDIRECT_URL = '/note/transfer/'
 
diff --git a/note_kfet/urls.py b/note_kfet/urls.py
index 90d44a07..4311c0b5 100644
--- a/note_kfet/urls.py
+++ b/note_kfet/urls.py
@@ -19,6 +19,7 @@ urlpatterns = [
     path('registration/', include('registration.urls')),
     path('activity/', include('activity.urls')),
     path('treasury/', include('treasury.urls')),
+    path('wei/', include('wei.urls')),
 
     # Include Django Contrib and Core routers
     path('i18n/', include('django.conf.urls.i18n')),