diff --git a/subjects/models.py b/subjects/models.py
index 5c0f667..9f5fcd9 100644
--- a/subjects/models.py
+++ b/subjects/models.py
@@ -42,6 +42,7 @@ class Subject(models.Model):
     class Meta:
         verbose_name = "Subject"
         verbose_name_plural = "Subjects"
+        ordering = ['name']
 
     def __str__(self):
         return self.name
diff --git a/subjects/static/subjects/js/modal_subject.js b/subjects/static/subjects/js/modal_subject.js
index 7088b0e..413b938 100644
--- a/subjects/static/subjects/js/modal_subject.js
+++ b/subjects/static/subjects/js/modal_subject.js
@@ -20,8 +20,12 @@ var delete_subject = {
       if($(id_modal).length){
         $(id_div_modal).empty();
       }
-      $(id_div_modal).append(data);
-      $(id_modal).modal('show');
+      if (!data['error']){ //If there is no error in the removing process, no message is shown
+        $(id_div_modal).append(data);
+        $(id_modal).modal('show');
+      }else{
+        window.location.href = data['url']; // If there is a error, we redirect to another URL
+      }
     });
   }
 };
\ No newline at end of file
diff --git a/subjects/templates/subjects/list.html b/subjects/templates/subjects/list.html
index b493a56..3bb5f51 100644
--- a/subjects/templates/subjects/list.html
+++ b/subjects/templates/subjects/list.html
@@ -98,7 +98,7 @@
                             {% endif %}
                             
                             <div class="panel-group subject-group" id="{{ category.slug }}-accordion" role="tablist" aria-multiselectable="true">
-                                {% for subject in category.subject_category.all  %}
+                                {% for subject in category.subject_category.all %}
                                     {% if request.user in subject.students.all or request.user.is_staff or request.user in subject.professor.all %}
                                         
                                         {% include "subjects/subject_card.html" %}
@@ -171,7 +171,7 @@
     <div id="modal_course">
     </div>
 
-    <div id="modal_subjct"></div>
+    <div id="modal_subject"></div>
     
     <script type="text/javascript" src="{% static 'js/course.js' %}"></script>
 {% endblock %}
diff --git a/subjects/views.py b/subjects/views.py
index 0fa32f2..b8a054f 100644
--- a/subjects/views.py
+++ b/subjects/views.py
@@ -32,7 +32,7 @@ from users.models import User
 class HomeView(LoginRequiredMixin, ListView):
     login_url = reverse_lazy("users:login")
     redirect_field_name = 'next'
-    queryset = Subject.objects.all()
+    queryset = Subject.objects.all().order_by('name')
     template_name = 'subjects/initial.html'
     context_object_name = 'subjects'
     paginate_by = 10    
@@ -63,7 +63,7 @@ class IndexView(LoginRequiredMixin, ListView):
 
     login_url = reverse_lazy("users:login")
     redirect_field_name = 'next'
-    queryset = Category.objects.all()
+    queryset = Category.objects.all().order_by('name')
     template_name = 'subjects/list.html'
     context_object_name = 'categories'
     paginate_by = 10
@@ -73,7 +73,7 @@ class IndexView(LoginRequiredMixin, ListView):
 
         if not self.request.user.is_staff:
             if not self.kwargs.get('option'):
-                categories = Category.objects.all()
+                categories = Category.objects.all().order_by('name')
 
                 categories = [category for category in categories if self.request.user in category.coordinators.all() \
                     or has_professor_profile(self.request.user, category) or has_student_profile(self.request.user, category)] 
@@ -205,13 +205,23 @@ class SubjectDeleteView(LoginRequiredMixin, LogMixin, DeleteView):
     template_name = 'subjects/delete.html'
 
     def dispatch(self, *args, **kwargs):
-       
+        
         return super(SubjectDeleteView, self).dispatch(*args, **kwargs)
 
+    def get(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        if self.object.students.all().count() > 0:
+            messages.error(self.request, _("Subject can't be removed. The subject still possess students and learning objects associated"))
+            
+            return JsonResponse({'error':True,'url':reverse_lazy('subjects:index')})
+        context = self.get_context_data(object=self.object)
+        return self.render_to_response(context)
     def get_context_data(self, **kwargs):
         context = super(SubjectDeleteView, self).get_context_data(**kwargs)
-        context['subject'] = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
+        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
+        context['subject'] = subject
 
+      
         if (self.request.GET.get('view') == 'index'):
             context['index'] = True
         else:
--
libgit2 0.21.2