diff --git a/src/Bundle/ChillActivityBundle/Controller/ActivityController.php b/src/Bundle/ChillActivityBundle/Controller/ActivityController.php
index 1dae24464..c5159526f 100644
--- a/src/Bundle/ChillActivityBundle/Controller/ActivityController.php
+++ b/src/Bundle/ChillActivityBundle/Controller/ActivityController.php
@@ -237,6 +237,11 @@ class ActivityController extends AbstractController
         if (!$entity) {
             throw $this->createNotFoundException('Unable to find Activity entity.');
         }
+        
+        if (null !== $accompanyingPeriod) {
+           $entity->personsAssociated = $entity->getPersonsAssociated();
+           $entity->personsNotAssociated = $entity->getPersonsNotAssociated();
+        }
 
         // TODO revoir le Voter de Activity pour tenir compte qu'une activité peut appartenir a une période
         // $this->denyAccessUnlessGranted('CHILL_ACTIVITY_SEE', $entity);
diff --git a/src/Bundle/ChillActivityBundle/Entity/Activity.php b/src/Bundle/ChillActivityBundle/Entity/Activity.php
index 53fd679e5..c0a25395c 100644
--- a/src/Bundle/ChillActivityBundle/Entity/Activity.php
+++ b/src/Bundle/ChillActivityBundle/Entity/Activity.php
@@ -419,6 +419,34 @@ class Activity implements HasCenterInterface, HasScopeInterface
         return $this->persons;
     }
 
+    public function getPersonsAssociated(): array 
+    {
+        if (null !== $this->accompanyingPeriod) {
+            $personsAssociated = [];
+            foreach ($this->accompanyingPeriod->getParticipations() as $participation) {
+                if ($this->persons->contains($participation->getPerson())) {
+                    $personsAssociated[] = $participation->getPerson();
+                }
+            }
+            return $personsAssociated; 
+        }
+        return [];
+    }
+    
+    public function getPersonsNotAssociated(): array
+    {
+        if (null !== $this->accompanyingPeriod) {
+            $personsNotAssociated = [];
+            foreach ($this->persons as $person) {
+                if (!in_array($person, $this->getPersonsAssociated())) {
+                     $personsNotAssociated[] = $person;
+                }
+            }
+            return $personsNotAssociated;
+        }
+        return [];
+    }    
+
     public function setPersons(?Collection $persons): self
     {
         $this->persons = $persons;
diff --git a/src/Bundle/ChillActivityBundle/Resources/views/Activity/concernedGroups.html.twig b/src/Bundle/ChillActivityBundle/Resources/views/Activity/concernedGroups.html.twig
index ee63aed54..6181784da 100644
--- a/src/Bundle/ChillActivityBundle/Resources/views/Activity/concernedGroups.html.twig
+++ b/src/Bundle/ChillActivityBundle/Resources/views/Activity/concernedGroups.html.twig
@@ -1,13 +1,13 @@
 {% if context == 'person' %}
     {% set blocs = [
-        { 'title': 'Persons associated'|trans, 'items': entity.persons },
-        { 'title': 'ThirdParties'|trans, 'items': entity.thirdParties },
+        { 'title': 'Others persons'|trans, 'items': entity.persons },
+        { 'title': 'Third parties'|trans, 'items': entity.thirdParties },
         { 'title': 'Users concerned'|trans, 'items': entity.users },
     ] %}
 {% else %}
     {% set blocs = [
-        { 'title': 'Persons in accompanying course'|trans, 'items': entity.persons },
-        { 'title': 'Third persons'|trans, 'items': entity.persons },
+        { 'title': 'Persons in accompanying course'|trans, 'items': entity.personsAssociated },
+        { 'title': 'Third persons'|trans, 'items': entity.personsNotAssociated },
         { 'title': 'ThirdParties'|trans, 'items': entity.thirdParties },
         { 'title': 'Users concerned'|trans, 'items': entity.users },
     ] %}
diff --git a/src/Bundle/ChillActivityBundle/translations/messages.fr.yml b/src/Bundle/ChillActivityBundle/translations/messages.fr.yml
index 793cb582a..532f25cf4 100644
--- a/src/Bundle/ChillActivityBundle/translations/messages.fr.yml
+++ b/src/Bundle/ChillActivityBundle/translations/messages.fr.yml
@@ -64,8 +64,8 @@ Choose a type: Choisir un type
 Concerned groups: Parties concernées
 Persons in accompanying course: Usagers du parcours
 Third persons: Tiers non-pro.
-Persons associated: Usagers
-ThirdParties: Tiers professionnels
+Others persons: Usagers
+Third parties: Tiers professionnels
 Users concerned: T(M)S