diff --git a/Formation/OTRERA_formation/Models/Test_Media.mo b/Formation/OTRERA_formation/Models/Test_Media.mo
new file mode 100644
index 0000000..c0a9ea0
--- /dev/null
+++ b/Formation/OTRERA_formation/Models/Test_Media.mo
@@ -0,0 +1,20 @@
+within OTRERA_formation.Models;
+
+
+model Test_Media
+  replaceable package Medium = Modelica.Media.Air.MoistAir constrainedby Modelica.Media.Interfaces.PartialMedium annotation(choicesAllMatching = true)  ;
+  //USER DEFINED PARAMETERS
+  parameter Modelica.Units.SI.Temperature T = 573.15 ; 
+  parameter Modelica.Units.SI.Pressure p = 155e5 ;
+  //INTERNAL VARIABLES
+  Medium.ThermodynamicState state ;
+  Modelica.Units.SI.Density d ;
+  
+  //IMPORTED COMPONENTS
+
+equation
+  state = Medium.setState_pTX(p=p,T=T);
+  d = Medium.density(state) ;
+
+
+end Test_Media;
\ No newline at end of file
diff --git a/Formation/OTRERA_formation/Models/Test_replaceable_media.mo b/Formation/OTRERA_formation/Models/Test_replaceable_media.mo
new file mode 100644
index 0000000..07b10e6
--- /dev/null
+++ b/Formation/OTRERA_formation/Models/Test_replaceable_media.mo
@@ -0,0 +1,8 @@
+within OTRERA_formation.Models;
+
+model Test_replaceable_media
+  Test_Media test_Media(T = 623.15, p = 1.4e7, redeclare package Medium = Modelica.Media.Water.WaterIF97_R1pT)  annotation(
+    Placement(transformation(origin = {2, 6}, extent = {{-10, -10}, {10, 10}})));
+equation
+
+end Test_replaceable_media;
\ No newline at end of file
diff --git a/Formation/OTRERA_formation/Models/package.order b/Formation/OTRERA_formation/Models/package.order
index 93793e7..1e6027b 100644
--- a/Formation/OTRERA_formation/Models/package.order
+++ b/Formation/OTRERA_formation/Models/package.order
@@ -1 +1,5 @@
 Coupled_model
+Coupled_model_prescribed
+Coupled_model_prescribed_variable
+Test_Media
+Test_replaceable_media