diff --git a/src/CMM/preset/preset.py b/src/CMM/preset/preset.py
new file mode 100644
index 0000000..c3d0e7f
--- /dev/null
+++ b/src/CMM/preset/preset.py
@@ -0,0 +1,116 @@
+from .preset_acquisition import *
+from .preset_external_data import *
+from .preset_components import *
+from .preset_gain import *
+from .preset_mixingmatrix import *
+from .preset_qubic import *
+from .preset_sky import *
+from .preset_tools import *
+
+
+class PresetInitialisation:
+    """Preset initialization.
+
+    Instance to initialize the Components Map-Making reading all the preset files.
+
+    Arguments
+    ---------
+    comm: MPI communicator
+        MPI common communicator (define by MPI.COMM_WORLD).
+    seed: int
+        Seed for random CMB realization.
+    seed_noise: int
+        Seed for random noise realization.
+
+    """
+
+    def __init__(self, comm, seed, seed_noise):
+        """
+        Initialize the class with MPI communication.
+
+        """
+
+        ### MPI common arguments
+        self.comm = comm
+        self.seed = seed
+        self.seed_noise = seed_noise
+
+        self.tools = None
+        self.qubic = None
+        self.fg = None
+        self.gain = None
+        self.acquisition = None
+        self.external = None
+        self.sky = None
+        self.mixingmatrix = None
+
+    def initialize(self):
+        """Initialization.
+
+        Method that initialize and return all the preset instances that will be used in Component Map-Making Pipeline.
+
+        """
+        self.tools = PresetTools(self.comm)
+        self.tools._print_message("========= Initialization =========")
+        self.tools._print_message("    => Checking simulation parameters")
+        self.tools.check_for_errors()
+        self.tools._print_message("    => No error detected !")
+        self.tools._print_message("    => Getting job ID")
+        self.job_id = os.environ.get("SLURM_JOB_ID")
+        self.tools._print_message("    => Creating folders")
+        if self.tools.rank == 0:
+            if self.tools.params["save_iter"] != 0:
+                self.tools.params["foldername"] = (
+                    f"{self.tools.params['Foregrounds']['Dust']['type']}_{self.tools.params['Foregrounds']['Dust']['model_d']}_{self.tools.params['QUBIC']['instrument']}_"
+                    + self.tools.params["foldername"]
+                )
+                self.tools.create_folder_if_not_exists(
+                    "CMM/" + self.tools.params["foldername"] + "/maps/"
+                )
+            if (
+                self.tools.params["Plots"]["maps"] == True
+                or self.tools.params["Plots"]["conv_beta"] == True
+            ):
+                self.tools.create_folder_if_not_exists(f"CMM/jobs/{self.job_id}/I")
+                self.tools.create_folder_if_not_exists(f"CMM/jobs/{self.job_id}/Q")
+                self.tools.create_folder_if_not_exists(f"CMM/jobs/{self.job_id}/U")
+                self.tools.create_folder_if_not_exists(
+                    f"CMM/jobs/{self.job_id}/allcomps"
+                )
+                self.tools.create_folder_if_not_exists(
+                    f"CMM/jobs/{self.job_id}/A_iter"
+                )
+
+        self.tools._print_message("========= External Data =========")
+        self.external = PresetExternal(self.tools)
+
+        self.tools._print_message("========= QUBIC =========")
+        self.qubic = PresetQubic(self.tools, self.external)
+
+        self.tools._print_message("========= Components =========")
+        self.comp = PresetComponents(self.tools, self.qubic, self.seed)
+
+        self.tools._print_message("========= Sky =========")
+        self.sky = PresetSky(self.tools, self.qubic)
+
+        self.tools._print_message("========= GAIN =========")
+        self.gain = PresetGain(self.tools, self.qubic)
+
+        self.tools._print_message("========= Mixing Matrix =========")
+        self.mixingmatrix = PresetMixingMatrix(self.tools, self.qubic, self.comp)
+
+        self.tools._print_message("========= Acquisition =========")
+        self.acquisition = PresetAcquisition(
+            self.seed_noise,
+            self.tools,
+            self.external,
+            self.qubic,
+            self.sky,
+            self.comp,
+            self.mixingmatrix,
+            self.gain,
+        )
+
+        self.tools.display_simulation_configuration()
+
+        return self