diff --git a/templates/objectives/skills/list.html b/templates/objectives/skills/list.html
index 1e2b4124fd..455d2312ff 100644
--- a/templates/objectives/skills/list.html
+++ b/templates/objectives/skills/list.html
@@ -80,7 +80,7 @@
             paging:         false,
             searching:      false,
             ordering:       false,
-            "bInfo" :       false,
+            // "bInfo" :       false,
         });
     });
 </script>
diff --git a/templates/objectives/skills/tree.html b/templates/objectives/skills/tree.html
index 176863f951..d6469bc250 100644
--- a/templates/objectives/skills/tree.html
+++ b/templates/objectives/skills/tree.html
@@ -3,10 +3,12 @@
 {% block header %}
 <style>
     svg {
-      /* width: 50%;
-      height: 50%; */
-      width: 25%;
-      height: 25%;
+        /* width: 50%;
+        height: 50%; */
+        width: 25%;
+        height: 25%;
+        display: block;
+        margin: auto;
     }
   </style>
 {% endblock %}
@@ -37,26 +39,33 @@
             + (string.split(/j/g).length - 1)
             + (string.split(/l/g).length - 1)
             + (string.split(/t/g).length - 1)
-            + (string.split(/\//g).length - 1);
+            + (string.split(/\//g).length - 1)
+            + (string.split(/,/g).length - 1)
+            + (string.split(/\(/g).length - 1)
+            + (string.split(/\)/g).length - 1);
         number_of_big_char = (string.split(/½/g).length - 1)
             + (string.split(/¾/g).length - 1)
             + (string.split(/B/g).length - 1)
-            + (string.split(/O/g).length - 1);
-        return string.length + (number_of_big_char / 2) - (number_of_spaces + (number_of_small_char / 2));
+            + (string.split(/O/g).length - 1)
+            + (string.split(/</g).length - 1);
+        return string.length + (number_of_big_char / 2) - (number_of_spaces + (number_of_small_char / 1.5));
+    }
+
+    function define_font_size(string)
+    {
+        return (1 / compute_font_size(string)) * 80;
     }
 
     (async () => {
         const data = [
             {% for key, value in node_dict.items %}
             {
-                "id": "{{ key.short_label }}",
+                "id": "{{ key.id }}",
+                "label": "{% autoescape off %}{{ key.short_label }}{% endautoescape %}",
                 "parentIds": [
-                    {% for prerequisite in value %}
-                        "{{ prerequisite.short_label }}",
-                    {% endfor %}
+                    {% for prerequisite in value %}"{{ prerequisite.id }}", {% endfor %}
                 ]
-            },
-            {% endfor %}
+            },{% endfor %}
         ]
 
         const dag = d3.dagStratify()(data);
@@ -162,12 +171,8 @@
         // Add text to nodes
         nodes
             .append("text")
-            .text((d) => d.data.id)
-            // .attr("font-size", "8")
-            // .attr("font-size", function(d) { return Math.min(2 * d.r, (2 * d.r - 8) / this.getComputedTextLength() * 24) + "px"; })
-            // .attr("font-size", function(d) {return (1 / d.data.id.length) * 60;})
-            // .attr("font-size", set_font_size(d.data.id))
-            .attr("font-size", function(d) {return (1 / compute_font_size(d.data.id)) * 80;})
+            .text((d) => d.data.label)
+            .attr("font-size", function(d) {return Math.min(define_font_size(d.data.label), 24);})
             .attr("font-weight", "bold")
             .attr("font-family", "sans-serif")
             .attr("text-anchor", "middle")
diff --git a/templates/ultron/dashboard/dashboard.html b/templates/ultron/dashboard/dashboard.html
index 355e0102a7..b1deafb656 100644
--- a/templates/ultron/dashboard/dashboard.html
+++ b/templates/ultron/dashboard/dashboard.html
@@ -11,7 +11,7 @@
                 <h4 class=""><i class="icon-primary fal fa-laugh-wink"></i> Hi {{ user.username }} !</h4>
             </div>
             <div class="card-body">
-                Welcome to Ultron v0.43 <span class="text-muted">(last update : 13-1-2022)</span><br />
+                Welcome to Ultron v0.44 <span class="text-muted">(last update : 14-1-2022)</span><br />
                 This application is there to help us manage the gymnasts (evolution, evaluation, routine, scores, ...). It is not perfect so feel free to make improvement proposals, bug reports, … by sending me an <a href="mailto:gregory@flyingacrobaticstrampoline.be">email</a>.<br/>
                 <br/>
                 <span class="text-danger"><b>Gelukkig nieuwjaar 2022 en mijn beste wensen!</b></span>
diff --git a/ultron/objective/admin.py b/ultron/objective/admin.py
index fd92b38334..8c84e4d27a 100644
--- a/ultron/objective/admin.py
+++ b/ultron/objective/admin.py
@@ -175,6 +175,10 @@ class PrerequisiteClosureAdmin(admin.ModelAdmin):
         "ancestor__long_label",
         "ancestor__short_label",
     )
+    list_filter = (
+        ("level", DropdownFilter),
+        ("path", DropdownFilter),
+    )
 
 
 admin.site.register(TouchPosition, TouchPositionAdmin)
diff --git a/ultron/objective/models.py b/ultron/objective/models.py
index 2dd8787d3d..213d523793 100644
--- a/ultron/objective/models.py
+++ b/ultron/objective/models.py
@@ -72,10 +72,9 @@ class Educative(Markdownizable):
     )
 
     def __str__(self):
-        return "%s - %s (level: %s | diff: %s)" % (
-            self.rank,
+        return "%s (%s - %s)" % (
             self.long_label,
-            self.level,
+            self.short_label,
             self.difficulty,
         )
  
diff --git a/ultron/objective/views.py b/ultron/objective/views.py
index 67edf98c8a..7455ae362a 100644
--- a/ultron/objective/views.py
+++ b/ultron/objective/views.py
@@ -1,5 +1,5 @@
 from django.contrib.auth.decorators import login_required
-from django.db.models import Q
+from django.db.models import Q, Max, Min
 from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
 from django.shortcuts import render, get_object_or_404
 from django.views.decorators.http import require_http_methods
@@ -130,7 +130,12 @@ def skill_details(request, skill_id):
 
     skill.save()
 
-    context = {"skill": skill}
+    min_tree_level = PrerequisiteClosure.objects.filter(ancestor=skill).aggregate(Min('level'))
+    # print(min_tree_level)
+    max_tree_level = PrerequisiteClosure.objects.filter(ancestor=skill).aggregate(Max('level'))
+    # print(max_tree_level)
+
+    context = {"skill": skill, "min_tree_level": min_tree_level, "max_tree_level": max_tree_level}
     return render(request, "objectives/skills/details.html", context)