diff --git a/conf.c b/conf.c
index 0255477..9913d62 100644
--- a/conf.c
+++ b/conf.c
@@ -147,7 +147,7 @@ void removeListener(ptListener listenerChain, int id) {
     }
 }
 
-void addConfToConfList(ptConfList confList, ptConf conf) {
+void addConfToConfList(ptConfList confList, ptConf conf, int grade) {
 	ptConfList px = confList;
 	
 	while (px -> next != NULL) {
@@ -156,6 +156,7 @@ void addConfToConfList(ptConfList confList, ptConf conf) {
 	
 	px -> conf = conf;
 	px -> next = (ptConfList) malloc(sizeof(tConfList));
+    px -> grade = grade;
 	px -> next -> next = NULL;
 }
 
@@ -164,13 +165,13 @@ void printConfList(ptConfList confList) {
 	
 	printf("Participation aux conferences : ");
 	while (px -> next != NULL) {
-		printf("%s ", px -> conf -> title);
+		printf("%s(%d) ", px -> conf -> title, px -> grade);
 		px = px -> next;
 	}
 	printf("\n");
 }
 
-void addListenerToListenerList(ptListenerList listenerList, ptListener listener) {
+void addListenerToListenerList(ptListenerList listenerList, ptListener listener, int grade) {
 	ptListenerList px = listenerList;
 	
 	while (px -> next != NULL) {
@@ -179,6 +180,7 @@ void addListenerToListenerList(ptListenerList listenerList, ptListener listener)
 	
 	px -> listener = listener;
 	px -> next = (ptListenerList) malloc(sizeof(tListenerList));
+    px -> grade = grade;
 	px -> next -> next = NULL;
 }
 
@@ -187,13 +189,13 @@ void printListenerList(ptListenerList listenerList) {
 	
 	printf("Participants : ");
 	while (px -> next != NULL) {
-		printf("%s ", px -> listener -> name);
+		printf("%s(%d) ", px -> listener -> name, px -> grade);
 		px = px -> next;
 	}
 	printf("\n");
 }
 
-void participateToConf(ptConf confChain, ptListener listenerChain, int confId, int listenerId) {
+void participateToConf(ptConf confChain, ptListener listenerChain, int confId, int listenerId, int grade) {
 	ptConf px = confChain;
 	ptListener py = listenerChain;
 	ptListenerList pz;
@@ -218,6 +220,36 @@ void participateToConf(ptConf confChain, ptListener listenerChain, int confId, i
 		return;
 	}
 	
-	addListenerToListenerList(px -> listeners, py);
-	addConfToConfList(py -> confs, px);
+	addListenerToListenerList(px -> listeners, py, grade);
+	addConfToConfList(py -> confs, px, grade);
+}
+
+int confGradeAvg(ptConf conf) {
+    ptListenerList px = conf -> listeners;
+    int total = 0, nb = 0;
+
+    while (px -> next != NULL) {
+        total += px -> grade;
+        nb++;
+        px = px -> next;
+    }
+
+    if (nb != 0) {
+        return total / nb;
+    } else {
+        return -1;
+    }
+
+}
+
+int confParticipations(ptConf conf) {
+    ptListenerList px = conf -> listeners;
+    int nb = 0;
+
+    while (px -> next != NULL) {
+        nb++;
+        px = px -> next;
+    }
+
+    return nb;
 }
\ No newline at end of file
diff --git a/conf.h b/conf.h
index 7924973..194d026 100644
--- a/conf.h
+++ b/conf.h
@@ -16,6 +16,7 @@ typedef struct conf {
 
 typedef struct confList {
 	struct conf* conf;
+	int grade;
 	struct confList* next;
 } tConfList;
 
@@ -31,6 +32,7 @@ typedef struct listener {
 
 typedef struct listenerList {
 	struct listener* listener;
+	int grade;
 	struct listenerList* next;
 } tListenerList;
 
@@ -47,10 +49,12 @@ int findListenerId(ptListener listenerChain);
 ptListener newListenerChain();
 void addListener(ptListener listenerChain, int id, char name[], int age, int level);
 void removeListener(ptListener listenerChain, int id);
-void addConfToConfList(ptConfList confList, ptConf conf);
+void addConfToConfList(ptConfList confList, ptConf conf, int grade);
 void printConfList(ptConfList confList);
-void addListenerToListenerList(ptListenerList listenerList, ptListener listener);
+void addListenerToListenerList(ptListenerList listenerList, ptListener listener, int grade);
 void printListenerList(ptListenerList listenerList);
-void participateToConf(ptConf confChain, ptListener listenerChain, int confId, int listenerId);
+void participateToConf(ptConf confChain, ptListener listenerChain, int confId, int listenerId, int grade);
+int confGradeAvg(ptConf conf);
+int confParticipations(ptConf conf);
 
 #endif // CONF_H
diff --git a/data/relations b/data/relations
index f53a0b2..ced4fda 100644
--- a/data/relations
+++ b/data/relations
@@ -1 +1 @@
-1:3,2,1,6,11,12,13,14,15,16
+1:1;12,2;12,12;0
diff --git a/fileManager.c b/fileManager.c
index 58c5296..e6d6088 100644
--- a/fileManager.c
+++ b/fileManager.c
@@ -4,56 +4,45 @@
 #include "conf.h"
 
 void readConfs(ptConf confChain) {
-	FILE *file = fopen("./data/confs", "r");
-	char line[100];
-	char *tokens[6];
-	char *token;
-	
-	if (file == NULL) {
-		printf("ça marche pas.");
-		return;
-	}
-	
-	while (fgets(line, sizeof(line), file)) {
-        token = strtok(line, ",");
-		
-		int i = 0;
+    FILE *file = fopen("./data/confs", "r");
+    char line[100];
+    char *token;
 
-        while (token != NULL && i < 6) {
-            tokens[i] = token;
-			i ++;
-            token = strtok(NULL, ",");
-        }
-		
-		addConf(confChain, atoi(tokens[0]), tokens[1], tokens[2], atoi(tokens[3]), atoi(tokens[4]), atoi(tokens[5]));
+    if (file == NULL) {
+        printf("ça marche pas.");
+        return;
+    }
+
+    while (fgets(line, sizeof(line), file)) {
+        int id = atoi(strtok(line, ","));
+        char *title = strtok(NULL, ",");
+        char *speaker = strtok(NULL, ",");
+        int day = atoi(strtok(NULL, ","));
+        int month = atoi(strtok(NULL, ","));
+        int year = atoi(strtok(NULL, ","));
+
+        addConf(confChain, id, title, speaker, day, month, year);
     }
 
     fclose(file);
 }
 
 void readListeners(ptListener listenerChain) {
-	FILE *file = fopen("./data/listeners", "r");
-	char line[100];
-	char *tokens[4];
-	char *token;
-	
-	if (file == NULL) {
-		printf("ça marche pas.");
-		return;
-	}
-	
-	while (fgets(line, sizeof(line), file)) {
-        token = strtok(line, ",");
-		
-		int i = 0;
+    FILE *file = fopen("./data/listeners", "r");
+    char line[100];
+    char *token;
 
-        while (token != NULL && i < 4) {
-            tokens[i] = token;
-			i ++;
-            token = strtok(NULL, ",");
-        }
-		
-		addListener(listenerChain, atoi(tokens[0]), tokens[1], atoi(tokens[2]), atoi(tokens[3]));
+    if (file == NULL) {
+        printf("ça marche pas.");
+        return;
+    }
+
+    while (fgets(line, sizeof(line), file)) {
+        int id = atoi(strtok(line, ","));
+        char *name = strtok(NULL, ",");
+        int day = atoi(strtok(NULL, ","));
+        int month = atoi(strtok(NULL, ","));
+        addListener(listenerChain, id, name, day, month);
     }
 
     fclose(file);
@@ -62,10 +51,8 @@ void readListeners(ptListener listenerChain) {
 void readRelations(ptConf confChain, ptListener listenerChain) {
 	FILE *file = fopen("./data/relations", "r");
 	char line[100];
-	char *tokens[50];
-	char *token;
-    int i;
-    int j;
+	char *token1;
+    char *token2;
 	
 	if (file == NULL) {
 		printf("ça marche pas.");
@@ -73,22 +60,13 @@ void readRelations(ptConf confChain, ptListener listenerChain) {
 	}
 	
 	while (fgets(line, sizeof(line), file)) {
-        token = strtok(line, ":");
-        printf("%d\n", atoi(token));
+        int confId = atoi(strtok(line, ":"));
 
-        i = 0;
-
-        while (token != NULL) {
-            tokens[i] = token;
-			i ++;
-            token = strtok(NULL, ",");
+        while ((token1 = strtok(NULL, ";")) != NULL && (token2 = strtok(NULL, ",")) != NULL) {
+            participateToConf(confChain, listenerChain, confId, atoi(token1), atoi(token2));
         }
     }
 
-    for (j = 1; j < i; j++) {
-        participateToConf(confChain, listenerChain, atoi(tokens[0]), atoi(tokens[j]));
-    }
-
     fclose(file);
 }
 
@@ -124,7 +102,7 @@ void saveRelations(ptConf confChain) {
         }            
 
         while (py -> next != NULL) {
-            fprintf(file, "%d", py -> listener -> id);
+            fprintf(file, "%d;%d", py -> listener -> id, py -> grade);
             if (py -> next -> next != NULL) {
                 fprintf(file, ",");
             } else {
diff --git a/main.exe b/main.exe
index 3fff024..396e74c 100644
Binary files a/main.exe and b/main.exe differ
diff --git a/screenManager.c b/screenManager.c
index 8d30915..9f45edd 100644
--- a/screenManager.c
+++ b/screenManager.c
@@ -83,10 +83,10 @@ void drawMenu(char *options[], int lenght) {
 }
 
 void menuConf(ptConf confChain, ptListener listenerChain) {
-	char *options[] = {"1/ Voir la liste des conferences", "2/ Ajouter une conference", "3/ Suprimer une conference", "4/ Retour"};
+	char *options[] = {"1/ Voir la liste des conferences", "2/ Ajouter une conference", "3/ Suprimer une conference", "4/ Supprimer les conferences inferieures a une date", "5/ Retour"};
 	system("cls");
-	drawMenu(options, 4);
-	goToCoords(0, 12);
+	drawMenu(options, 5);
+	goToCoords(0, 13);
 	printf("Que voulez-vous faire ? : ");
 	int choice;
 	scanf("%d", &choice);
@@ -94,21 +94,27 @@ void menuConf(ptConf confChain, ptListener listenerChain) {
 	switch (choice)
 	{
 	case 1:
-		system ("cls");
+	{
 		ptConf px = confChain;
 	
 		while (px -> next != NULL) {
-			printf("id : %d\ntitle : %s\nspeaker : %s\n", px -> id, px -> title, px -> speaker);
-			printf("%d/%d/%d\n",px -> day, px -> month, px -> year);
+			printf("Id : %d\nTitre : %s\nConférencier : %s\n", px -> id, px -> title, px -> speaker);
+			printf("Date : %d/%d/%d\n",px -> day, px -> month, px -> year);
+			printf("Nombre de participants : %d\n", confParticipations(px));
 			if (px -> listeners -> next != NULL ) {
 				printListenerList(px -> listeners);
 			}
+			int avg;
+			if ((avg = confGradeAvg(px) != -1)) {
+				printf("Moyenne des notes : %d\n", confGradeAvg(px));
+			}
 			printf("\n");
 			px = px -> next;
 		}
 		system("pause");
 		menuConf(confChain, listenerChain);
 		break;
+	}
 
 	case 2:
 	{
@@ -148,6 +154,33 @@ void menuConf(ptConf confChain, ptListener listenerChain) {
 	}
 
 	case 4:
+	{
+		int day, month, year, time;
+		printf("Jour : ");
+		scanf("%d", &day);
+		printf("Mois : ");
+		scanf("%d", &month);
+		printf("Annee : ");
+		scanf("%d", &year);
+
+		time = day + 31 * month * 365 * year;
+
+		ptConf px = confChain;
+
+		while(px -> next != NULL) {
+			if ((px -> day + px -> month * 31 + px -> year * 365) < time) {
+				ptConf py = px -> next;
+				removeConf(confChain, px -> id);
+				px = py;
+			} else {
+				px = px -> next;
+			}
+		}
+
+		menuConf(confChain, listenerChain);
+	}
+
+	case 5:
 		menu(confChain, listenerChain);
 		break;
 	
@@ -168,7 +201,7 @@ void menuAbo(ptConf confChain, ptListener listenerChain) {
 	switch (choice)
 	{
 	case 1:
-		system ("cls");
+	{
 		ptListener py = listenerChain;
 	
 		while (py -> next != NULL) {
@@ -182,6 +215,7 @@ void menuAbo(ptConf confChain, ptListener listenerChain) {
 		system("pause");
 		menuAbo(confChain, listenerChain);
 		break;
+	}
 
 	case 2:
 	{
@@ -226,10 +260,10 @@ void menuAbo(ptConf confChain, ptListener listenerChain) {
 
 void menu(ptConf confChain, ptListener listenerChain)
 {
-	char *options[] = {"1/ Gestion des conferences", "2/ Gestion des abonnes", "3/ Participer a une conference", "4/ Voir la meilleure conference", "5/ Voir la participation a une conference", "6/ Quitter"};
+	char *options[] = {"1/ Gestion des conferences", "2/ Gestion des abonnes", "3/ Participer a une conference", "4/ Voir la meilleure conference", "5/ Quitter"};
 	system("cls");
-	drawMenu(options, 6);
-	goToCoords(0, 14);
+	drawMenu(options, 5);
+	goToCoords(0, 13);
 	printf("Que voulez-vous faire ? : ");
 	int choice;
 	scanf("%d", &choice);
@@ -246,26 +280,46 @@ void menu(ptConf confChain, ptListener listenerChain)
 
 	case 3:
 	{
-		int confId, listenerId;
+		int confId, listenerId, grade;
 		printf("Entrez l'ID de la conference : ");
 		scanf("%d", &confId);
 		printf("Entrez l'ID du participant : ");
 		scanf("%d", &listenerId);
+		printf("Entrez la note attribuée par le participant : ");
+		scanf("%d", &grade);
 		
-		participateToConf(confChain, listenerChain, confId, listenerId);
+		participateToConf(confChain, listenerChain, confId, listenerId, grade);
 		saveRelations(confChain);
 		menu(confChain, listenerChain);
 		break;
 	}
 
 	case 4:
+	{
+		ptConf px = confChain;
+		int max = confGradeAvg(px);
+		ptConf confMax = px;
+
+		while (px -> next != NULL) {
+			int tmp = confGradeAvg(px);
+			if (tmp > max) {
+				confMax = px;
+				max = tmp;
+			}
+
+			px = px -> next;
+		}
+
+		printf("La conférence la mieux notée est : %s\n\n", confMax -> title);
+
+		system("pause");
+		menu(confChain, listenerChain);
+
 		break;
+	}
 
 	case 5:
 		break;
-		
-	case 6:
-		break;
 	
 	default:
 		break;