diff --git a/figs/complex_makefile.svg b/figs/complex_makefile.svg
index 45e309d1d39cfe24b6ff9906f67d4506ab24d9f6..3232c92b37011ee30e40debce7b8299c5be16d9a 100644
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diff --git a/index.md b/index.md
index 14ea4c8558d413d595302cc62e9fe952e80c9ebe..11ae8f6e661d729f86eae3c7d6222527b1cbda68 100644
--- a/index.md
+++ b/index.md
@@ -37,6 +37,21 @@ corrige: false
 
 ## Base 2 [PDF](base_2.pdf)
 
+- Représentation variables en mémoire.
+- Les pointeurs.
+- Les fonctions.
+- Les tableaux.
+
+## Base 3 [PDF](base_3.pdf)
+
+- Structures.
+- Allocation dynamique de mémoire.
+- Prototypes de fonctions.
+- Génération d'un exécutable.
+- Préprocesseur.
+
+## Introduction à `make` [PDF](make.pdf)
+
 - Représentation variables en mémoire.
 - Les pointeurs.
 - Les fonctions.
diff --git a/make.md b/make.md
index b17a4812cc2e819a16c9ed37cfa3749225e827b7..04ae295de16ac26406823a350a7ca864176ebcad 100644
--- a/make.md
+++ b/make.md
@@ -112,4 +112,80 @@ rebuild: clean hello
 ![`Makefile` complexe.](figs/complex_makefile.svg){#fig:complex_makefile width=100%}
 
 :::
-::::::::::::::
\ No newline at end of file
+::::::::::::::
+
+# Factorisation
+
+:::::::::::::: {.columns}
+
+::: {.column width="55%"}
+## Ancien `Makefile`
+
+```bash
+hello: hello.o main.o
+    gcc hello.o main.o -o hello
+
+hello.o: hello.c hello.h
+    gcc -Wall -Wextra -c hello.c
+
+main.o: main.c
+    gcc -Wall -Wextra -c main.c
+
+clean:
+    rm -f *.o hello
+
+rebuild: clean hello
+```
+:::
+::: {.column width="45%"}
+
+## Nouveau `Makefile`
+
+```bash
+CC=gcc -Wall -Wextra
+
+hello: hello.o main.o
+    $(CC) $^ -o $@
+
+hello.o: hello.c hello.h
+    $(CC) -c $<
+
+main.o: main.c
+    $(CC) -c $<
+
+clean:
+    rm -f *.o hello
+
+rebuild: clean hello
+```
+
+:::
+::::::::::::::
+
+# Variables
+
+## Variables utilisateur
+
+- Déclaration
+ 
+    ```bash
+    id = valeur
+    id = valeur1 valeur2 valeur3
+    ```
+- Utilisation
+ 
+    ```bash
+    $(id)
+    ```
+- Déclaration à la ligne de commande
+
+    ```bash
+    make CFLAGS="-O3 -Wall"
+    ```
+
+## Variables internes
+
+- `$@` : la cible
+- `$^` : la liste des dépendances
+- `$<` : la première dépendance
+- `$*` : le nom de la cible sans extension