diff --git a/apps/participation/templates/participation/participation_detail.html b/apps/participation/templates/participation/participation_detail.html
index 8d1de32..a232fbd 100644
--- a/apps/participation/templates/participation/participation_detail.html
+++ b/apps/participation/templates/participation/participation_detail.html
@@ -75,7 +75,15 @@
                             {% endblocktrans %}
                         </div>
                     {% elif current_phase.phase_number == 4 %}
-                        {# TODO View synthesis #}
+                        <dl class="row">
+                            <dt class="col-xl-5 text-right">{% trans "Synthesis from the other team:" %}</dt>
+                            <dd class="col-sm-7"><a href="{{ participation.received_participation.synthesis.link|default:"#" }}"{% if participation.received_participation.synthesis.link %} target="_blank"{% endif %}>
+                                {{ participation.received_participation.synthesis.link|default:novideo }}</a>
+                                {% if participation.received_participation.synthesis.link %}
+                                    <button class="btn btn-info" data-toggle="modal" data-target="#displayOtherSynthesisModal">{% trans "Display" %}</button>
+                                {% endif %}
+                            </dd>
+                        </dl>
                     {% endif %}
                 </div>
             </div>
@@ -99,7 +107,7 @@
                         <dd class="col-sm-7"><a href="{{ participation.received_participation.solution.link|default:"#" }}"{% if participation.received_participation.solution.link %} target="_blank"{% endif %}>
                             {{ participation.received_participation.solution.link|default:novideo }}</a>
                             {% if participation.received_participation.solution.link %}
-                                <button class="btn btn-info" data-toggle="modal" data-target="#displaySolutionModal">{% trans "Display" %}</button>
+                                <button class="btn btn-info" data-toggle="modal" data-target="#displayOtherSolutionModal">{% trans "Display" %}</button>
                             {% endif %}
                         </dd>
 
@@ -137,7 +145,19 @@
                             {% endblocktrans %}
                         </div>
                     {% elif current_phase.phase_number == 4 %}
-                        {# TODO Send synthesis #}
+                        <div id="solution-container">
+                            <dl class="row">
+                                {% trans "No video sent" as novideo %}
+                                <dt class="col-sm-5 text-right">{% trans "Your synthesis of the exchange:" %}</dt>
+                                <dd class="col-sm-7"><a href="{{ participation.synthesis.link|default:"#" }}"{% if participation.synthesis.link %} target="_blank"{% endif %}>
+                                    {{ participation.synthesis.link|default:novideo }}</a>
+                                    <button class="btn btn-primary" data-toggle="modal" data-target="#uploadSynthesisModal">{% trans "Upload" %}</button>
+                                    {% if participation.synthesis.link %}
+                                        <button class="btn btn-info" data-toggle="modal" data-target="#displaySynthesisModal">{% trans "Display" %}</button>
+                                    {% endif %}
+                                </dd>
+                            </dl>
+                        </div>
                     {% endif %}
                     </dl>
                 </div>
@@ -162,6 +182,7 @@
 {% trans "Upload" as modal_button %}
 {% url "participation:upload_video" pk=participation.solution_id as modal_action %}
 {% include "base_modal.html" with modal_id="uploadSolution" %}
+
 {% trans "Display solution" as modal_title %}
 {% trans "This video platform is not supported yet." as unsupported_platform %}
 {% include "base_modal.html" with modal_id="displaySolution" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.solution.as_iframe|default:unsupported_platform %}
@@ -171,7 +192,7 @@
     {% if participation.received_participation.solution.link %}
         {% trans "Display solution" as modal_title %}
         {% trans "This video platform is not supported yet." as unsupported_platform %}
-        {% include "base_modal.html" with modal_id="displaySolution" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.received_participation.solution.as_iframe|default:unsupported_platform %}
+        {% include "base_modal.html" with modal_id="displayOtherSolution" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.received_participation.solution.as_iframe|default:unsupported_platform %}
     {% endif %}
 {% endif %}
 
@@ -201,6 +222,25 @@
         {% endwith %}
     {% endfor %}
 {% endif %}
+
+{% if current_phase.phase_number >= 4 %}
+    {% if participation.received_participation.synthesis.link %}
+        {% trans "Display synthesis" as modal_title %}
+        {% trans "This video platform is not supported yet." as unsupported_platform %}
+        {% include "base_modal.html" with modal_id="displayOtherSynthesis" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.received_participation.synthesis.as_iframe|default:unsupported_platform %}
+    {% endif %}
+
+    {% trans "Upload video" as modal_title %}
+    {% trans "Upload" as modal_button %}
+    {% url "participation:upload_video" pk=participation.synthesis_id as modal_action %}
+    {% include "base_modal.html" with modal_id="uploadSynthesis" %}
+
+    {% if participation.synthesis.link %}
+        {% trans "Display synthesis" as modal_title %}
+        {% trans "This video platform is not supported yet." as unsupported_platform %}
+        {% include "base_modal.html" with modal_id="displaySynthesis" modal_action="" modal_button="" modal_additional_class="modal-lg" modal_content=participation.synthesis.as_iframe|default:unsupported_platform %}
+    {% endif %}
+{% endif %}
 {% endblock %}
 
 {% block extrajavascript %}
@@ -247,6 +287,14 @@
                 if (!modalBody.html().trim())
                     modalBody.load("{% url "participation:upload_video" pk=participation.solution_id %} #form-content");
             });
+
+            {% if current_phase.phase_number == 4 %}
+                $('button[data-target="#uploadSynthesisModal"]').click(function() {
+                    let modalBody = $("#uploadSynthesisModal div.modal-body");
+                    if (!modalBody.html().trim())
+                        modalBody.load("{% url "participation:upload_video" pk=participation.synthesis_id %} #form-content");
+                });
+            {% endif %}
         });
     </script>
 {% endblock %}
diff --git a/locale/fr/LC_MESSAGES/django.po b/locale/fr/LC_MESSAGES/django.po
index 9ea9b49..2d77018 100644
--- a/locale/fr/LC_MESSAGES/django.po
+++ b/locale/fr/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Corres2math\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-10-31 22:13+0100\n"
+"POT-Creation-Date: 2020-11-01 20:50+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: Yohann D'ANELLO <yohann.danello@animath.fr>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -250,23 +250,23 @@ msgstr "vidéos"
 msgid "question"
 msgstr "question"
 
-#: apps/participation/models.py:256
+#: apps/participation/models.py:259
 msgid "phase number"
 msgstr "phase"
 
-#: apps/participation/models.py:261
+#: apps/participation/models.py:264
 msgid "phase description"
 msgstr "description"
 
-#: apps/participation/models.py:265
+#: apps/participation/models.py:268
 msgid "start date of the given phase"
 msgstr "début de la phase"
 
-#: apps/participation/models.py:270
+#: apps/participation/models.py:273
 msgid "end date of the given phase"
 msgstr "fin de la phase"
 
-#: apps/participation/models.py:288
+#: apps/participation/models.py:291
 msgid ""
 "Phase {phase_number:d} starts on {start:%Y-%m-%d %H:%M} and ends on {end:%Y-"
 "%m-%d %H:%M}"
@@ -274,11 +274,11 @@ msgstr ""
 "Phase {phase_number:d} démarrant le {start:%d/%m/%Y %H:%M} et finissant le "
 "{end:%d/%m/%Y %H:%M}"
 
-#: apps/participation/models.py:292
+#: apps/participation/models.py:295
 msgid "phase"
 msgstr "phase"
 
-#: apps/participation/models.py:293
+#: apps/participation/models.py:296
 msgid "phases"
 msgstr "phases"
 
@@ -316,16 +316,19 @@ msgid "Chosen problem:"
 msgstr "Problème choisi :"
 
 #: apps/participation/templates/participation/participation_detail.html:22
+#: apps/participation/templates/participation/participation_detail.html:150
 msgid "No video sent"
 msgstr "Pas de vidéo envoyée"
 
 #: apps/participation/templates/participation/participation_detail.html:23
-#: apps/participation/templates/participation/participation_detail.html:98
+#: apps/participation/templates/participation/participation_detail.html:106
 msgid "Proposed solution:"
 msgstr "Solution proposée :"
 
 #: apps/participation/templates/participation/participation_detail.html:27
-#: apps/participation/templates/participation/participation_detail.html:162
+#: apps/participation/templates/participation/participation_detail.html:154
+#: apps/participation/templates/participation/participation_detail.html:182
+#: apps/participation/templates/participation/participation_detail.html:235
 #: apps/participation/templates/participation/upload_video.html:11
 #: apps/registration/templates/registration/upload_photo_authorization.html:18
 #: apps/registration/templates/registration/user_detail.html:78
@@ -333,7 +336,9 @@ msgid "Upload"
 msgstr "Téléverser"
 
 #: apps/participation/templates/participation/participation_detail.html:30
-#: apps/participation/templates/participation/participation_detail.html:102
+#: apps/participation/templates/participation/participation_detail.html:83
+#: apps/participation/templates/participation/participation_detail.html:110
+#: apps/participation/templates/participation/participation_detail.html:156
 msgid "Display"
 msgstr "Afficher"
 
@@ -346,8 +351,8 @@ msgid "Team that received your solution:"
 msgstr "Équipe qui a reçu votre solution :"
 
 #: apps/participation/templates/participation/participation_detail.html:53
-#: apps/participation/templates/participation/participation_detail.html:94
-#: apps/participation/templates/participation/participation_detail.html:118
+#: apps/participation/templates/participation/participation_detail.html:102
+#: apps/participation/templates/participation/participation_detail.html:126
 msgid "Change"
 msgstr "Modifier"
 
@@ -380,15 +385,19 @@ msgstr ""
 "client Element dédié : <a href=\"https://element.correspondances-maths.fr"
 "\">element.correpondances-maths.fr</a>"
 
-#: apps/participation/templates/participation/participation_detail.html:86
+#: apps/participation/templates/participation/participation_detail.html:79
+msgid "Synthesis from the other team:"
+msgstr "Synthèse de l'autre équipe :"
+
+#: apps/participation/templates/participation/participation_detail.html:94
 msgid "Received solution"
 msgstr "Solution reçue"
 
-#: apps/participation/templates/participation/participation_detail.html:90
+#: apps/participation/templates/participation/participation_detail.html:98
 msgid "Team that sent you their solution:"
 msgstr "Équipe qui vous a envoyé leur solution :"
 
-#: apps/participation/templates/participation/participation_detail.html:108
+#: apps/participation/templates/participation/participation_detail.html:116
 msgid ""
 "You received a solution about the same problem that you treated from another "
 "team. You are now encouraged to see the video, then to ask from 3 to 6 "
@@ -400,11 +409,11 @@ msgstr ""
 "vidéo, puis à poser 3 à 6 questions à propos de la vidéo. Après cela, vous "
 "serez invités à échanger avec l'autre équipe à propos de la solution."
 
-#: apps/participation/templates/participation/participation_detail.html:125
+#: apps/participation/templates/participation/participation_detail.html:133
 msgid "Add a question"
 msgstr "Ajouter une question"
 
-#: apps/participation/templates/participation/participation_detail.html:130
+#: apps/participation/templates/participation/participation_detail.html:138
 #, python-format
 msgid ""
 "You sent your questions to the other team about their solution. When they "
@@ -423,13 +432,17 @@ msgstr ""
 "client Element dédié : <a href=\"https://element.correspondances-maths.fr"
 "\">element.correpondances-maths.fr</a>"
 
-#: apps/participation/templates/participation/participation_detail.html:150
+#: apps/participation/templates/participation/participation_detail.html:151
+msgid "Your synthesis of the exchange:"
+msgstr "Votre synthèse de l'échange :"
+
+#: apps/participation/templates/participation/participation_detail.html:170
 msgid "Define received video"
 msgstr "Définir la vidéo reçue"
 
-#: apps/participation/templates/participation/participation_detail.html:151
-#: apps/participation/templates/participation/participation_detail.html:156
-#: apps/participation/templates/participation/participation_detail.html:189
+#: apps/participation/templates/participation/participation_detail.html:171
+#: apps/participation/templates/participation/participation_detail.html:176
+#: apps/participation/templates/participation/participation_detail.html:210
 #: apps/participation/templates/participation/phase_form.html:11
 #: apps/participation/templates/participation/phase_list.html:18
 #: apps/participation/templates/participation/receive_participation_form.html:11
@@ -443,46 +456,54 @@ msgstr "Définir la vidéo reçue"
 msgid "Update"
 msgstr "Modifier"
 
-#: apps/participation/templates/participation/participation_detail.html:155
+#: apps/participation/templates/participation/participation_detail.html:175
 msgid "Define team that receives your video"
 msgstr "Définir l'équipe qui recevra votre vidéo"
 
-#: apps/participation/templates/participation/participation_detail.html:161
+#: apps/participation/templates/participation/participation_detail.html:181
+#: apps/participation/templates/participation/participation_detail.html:234
 msgid "Upload video"
 msgstr "Envoyer la vidéo"
 
-#: apps/participation/templates/participation/participation_detail.html:165
-#: apps/participation/templates/participation/participation_detail.html:172
+#: apps/participation/templates/participation/participation_detail.html:186
+#: apps/participation/templates/participation/participation_detail.html:193
 msgid "Display solution"
 msgstr "Afficher la solution"
 
-#: apps/participation/templates/participation/participation_detail.html:166
-#: apps/participation/templates/participation/participation_detail.html:173
+#: apps/participation/templates/participation/participation_detail.html:187
+#: apps/participation/templates/participation/participation_detail.html:194
+#: apps/participation/templates/participation/participation_detail.html:230
+#: apps/participation/templates/participation/participation_detail.html:241
 msgid "This video platform is not supported yet."
 msgstr "La plateforme de cette vidéo n'est pas encore supportée."
 
-#: apps/participation/templates/participation/participation_detail.html:179
+#: apps/participation/templates/participation/participation_detail.html:200
 msgid "Add question"
 msgstr "Ajouter une question"
 
-#: apps/participation/templates/participation/participation_detail.html:180
+#: apps/participation/templates/participation/participation_detail.html:201
 msgid "Add"
 msgstr "Ajouter"
 
-#: apps/participation/templates/participation/participation_detail.html:186
-#: apps/participation/templates/participation/participation_detail.html:197
+#: apps/participation/templates/participation/participation_detail.html:207
+#: apps/participation/templates/participation/participation_detail.html:218
 #: apps/participation/templates/participation/question_confirm_delete.html:14
 msgid "Delete"
 msgstr "Supprimer"
 
-#: apps/participation/templates/participation/participation_detail.html:188
+#: apps/participation/templates/participation/participation_detail.html:209
 msgid "Update question"
 msgstr "Modifier la question"
 
-#: apps/participation/templates/participation/participation_detail.html:196
+#: apps/participation/templates/participation/participation_detail.html:217
 msgid "Delete question"
 msgstr "Supprimer la question"
 
+#: apps/participation/templates/participation/participation_detail.html:229
+#: apps/participation/templates/participation/participation_detail.html:240
+msgid "Display synthesis"
+msgstr "Afficher la synthèse"
+
 #: apps/participation/templates/participation/phase_list.html:10
 #: templates/base.html:68 templates/base.html:70 templates/base.html:217
 msgid "Calendar"