diff --git a/_quarto.yml b/_quarto.yml
index 667fb9b..fef82d1 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -54,6 +54,8 @@ book:
         - chapters/day1_intro.qmd
         - chapters/day1_what-eco-net.qmd
         - chapters/day2_metrics.qmd
+        - chapters/day3_sbm.qmd
+        - chapters/day4_multilevel.qmd
     - part: "EXERCISES"
       chapters:
         - text: (day 1) igraph exercise
@@ -65,7 +67,7 @@ book:
         - text: (day 3) SBM
           href: chapters/day3_files/TutorialBM.html
 #        - chapters/TutorialBM.qmd
-        - text: (day 4) Multilevel
+        - text: (day 4) multilevel
           href: chapters/day4_files/TutorialDattilo.html
 #        - chapters/TutorialDattilo.qmd
 
diff --git a/chapters/cours/day3_cours_SMB_LBM.pdf b/chapters/cours/day3_cours_SMB_LBM.pdf
new file mode 100644
index 0000000..6628e0a
Binary files /dev/null and b/chapters/cours/day3_cours_SMB_LBM.pdf differ
diff --git a/chapters/cours/day4_cours_multilevels.pdf b/chapters/cours/day4_cours_multilevels.pdf
new file mode 100644
index 0000000..3a88e17
Binary files /dev/null and b/chapters/cours/day4_cours_multilevels.pdf differ
diff --git a/chapters/cours/day5_cours_collection.pdf b/chapters/cours/day5_cours_collection.pdf
new file mode 100644
index 0000000..a5c0ba5
Binary files /dev/null and b/chapters/cours/day5_cours_collection.pdf differ
diff --git a/chapters/day1_intro.qmd b/chapters/day1_intro.qmd
index 71e73fc..42d3dbe 100644
--- a/chapters/day1_intro.qmd
+++ b/chapters/day1_intro.qmd
@@ -1,16 +1,16 @@
 
 ::: {.callout-note icon=true appearance="simple"}
-## (day 2) Network metrics {.unnumbered}
+## (day 1) Introduction to networks {.unnumbered}
 
 <br />
-{{< fa user >}} &nbsp;**Author:** [François Massol](http://cmatias.perso.math.cnrs.fr/)<br/>
-{{< fa brands github >}} &nbsp;**Source:** <https://github.com/econetoolbox/data/tree/main/day2_files/><br/>
-{{< fa globe >}} &nbsp;**Slides:** <https://econettoolbox.github.io/chapters/cours/day2_cours_metrics.pdf>
+{{< fa user >}} &nbsp;**Author:** [Catherine Matias](http://cmatias.perso.math.cnrs.fr/)<br/>
+{{< fa brands github >}} &nbsp;**Source:** <https://github.com/econetoolbox/data/tree/main/day1_files/><br/>
+{{< fa globe >}} &nbsp;**Slides:** <https://econettoolbox.github.io/chapters/cours/day1_cours1_intro.pdf>
 :::
 
 
 <br />
 
 <div class="container">
-  <iframe class="responsive-iframe" src="cours/day2_cours_metrics.pdf"></iframe>
+  <iframe class="responsive-iframe" src="cours/day1_cours1_intro.pdf"></iframe>
 </div> 
diff --git a/chapters/day3_sbm.qmd b/chapters/day3_sbm.qmd
new file mode 100644
index 0000000..fa47843
--- /dev/null
+++ b/chapters/day3_sbm.qmd
@@ -0,0 +1,17 @@
+
+::: {.callout-note icon=true appearance="simple"}
+## (day 3) SBM {.unnumbered}
+
+<br />
+{{< fa user >}} &nbsp;**Author:** [Sophie Donnet](https://sophiedonnet.github.io/)<br/>
+{{< fa brands github >}} &nbsp;**Source:** <https://github.com/econetoolbox/data/tree/main/day3_files/><br/>
+{{< fa globe >}} &nbsp;**Slides:** <https://econettoolbox.github.io/chapters/cours/day3_cours_SBM_LBM.pdf>
+:::
+
+
+<br />
+
+<div class="container">
+  <iframe class="responsive-iframe" src="cours/day3_cours_SBM_LBM.pdf"></iframe>
+</div> 
+
diff --git a/chapters/day4_multilevel.qmd b/chapters/day4_multilevel.qmd
new file mode 100644
index 0000000..7300f37
--- /dev/null
+++ b/chapters/day4_multilevel.qmd
@@ -0,0 +1,17 @@
+
+::: {.callout-note icon=true appearance="simple"}
+## (day 3) multilevel {.unnumbered}
+
+<br />
+{{< fa user >}} &nbsp;**Author:** [Sophie Donnet](https://sophiedonnet.github.io/)<br/>
+{{< fa brands github >}} &nbsp;**Source:** <https://github.com/econetoolbox/data/tree/main/day4_files/><br/>
+{{< fa globe >}} &nbsp;**Slides:** <https://econettoolbox.github.io/chapters/cours/day4_cours_multilevels.pdf>
+:::
+
+
+<br />
+
+<div class="container">
+  <iframe class="responsive-iframe" src="cours/day4_cours_multilevels.pdf"></iframe>
+</div> 
+