diff --git a/src/Model/Tools/PamhyrDB.py b/src/Model/Tools/PamhyrDB.py
index a9d95cfe..3aa4478d 100644
--- a/src/Model/Tools/PamhyrDB.py
+++ b/src/Model/Tools/PamhyrDB.py
@@ -185,6 +185,13 @@ class SQLSubModel(PamhyrID):
         else:
             self._owner_scenario = owner_scenario
 
+    def __str__(self):
+        t = type(self)
+        return (
+            f"'{t.__module__}.{t.__name__}" +
+            f"@{self._pamhyr_id}.{self._owner_scenario}'"
+        )
+
     def must_be_saved(self):
         """Return True if this object MUST be save in the save file.
 
diff --git a/src/View/Ensembles/Edit/Window.py b/src/View/Ensembles/Edit/Window.py
index d773f77f..e171e369 100644
--- a/src/View/Ensembles/Edit/Window.py
+++ b/src/View/Ensembles/Edit/Window.py
@@ -22,6 +22,9 @@ from tools import trace, timer, logger_exception
 
 from View.Tools.PamhyrWindow import PamhyrWindow, PamhyrDialog
 from View.Tools.PamhyrWidget import PamhyrWidget
+from View.Tools.PamhyrTree import (
+    PamhyrModelRoot, PamhyrModelItem, PamhyrModelListItem,
+)
 
 from PyQt5.QtGui import (
     QKeySequence,
@@ -39,12 +42,26 @@ from PyQt5.QtWidgets import (
     QFileDialog, QTableView, QAbstractItemView,
     QUndoStack, QShortcut, QAction, QItemDelegate,
     QComboBox, QVBoxLayout, QHeaderView, QTabWidget,
-    QGroupBox,
+    QGroupBox, QTreeWidget,
 )
 
 logger = logging.getLogger()
 
 
+class StricklersModelItem(PamhyrModelItem):
+    def __init__(self, data=None, trad=None, parent=None):
+        super(StricklersModelItem, self).__init__(
+            data=data, trad=trad, parent=parent,
+        )
+
+    def _get_name(self):
+        return str(self._data)
+
+    def _setup_children(self):
+        self.addChild(PamhyrModelItem(data="Minor", parent=self))
+        self.addChild(PamhyrModelItem(data="Medium", parent=self))
+
+
 class EnsembleEditDialog(PamhyrDialog):
     _pamhyr_ui = "EnsembleEditDialog"
     _pamhyr_name = "Parameters"
@@ -61,7 +78,21 @@ class EnsembleEditDialog(PamhyrDialog):
         self._study = study
         self._ensemble = ensemble
 
+        self._init_tree()
         self._init_default_values()
+        self._init_connection()
+
+    def _init_tree(self):
+        tree = self.find(QTreeWidget, "treeWidget_target_data")
+        tree.setColumnCount(1)
+        tree.setHeaderLabels(["Name"])
+
+        stricklers = PamhyrModelListItem(
+            name="Stricklers",
+            lst=self._study.river.stricklers,
+            child_item_ctor=StricklersModelItem,
+            parent=tree
+        )
 
     def _init_default_values(self):
         self.set_line_edit_text("lineEdit_name", self._ensemble.name)
@@ -84,6 +115,11 @@ class EnsembleEditDialog(PamhyrDialog):
 
             self._set_widget(self._ensemble.distribution)
 
+
+    def _init_connection(self):
+        self.find(QComboBox, "comboBox_distribution")\
+            .currentTextChanged.connect(self.update_distribution)
+
         self.find(QComboBox, "comboBox_distribution")\
             .currentTextChanged.connect(self.update_distribution)
 
diff --git a/src/View/Tools/PamhyrTree.py b/src/View/Tools/PamhyrTree.py
new file mode 100644
index 00000000..871ac9bd
--- /dev/null
+++ b/src/View/Tools/PamhyrTree.py
@@ -0,0 +1,83 @@
+# PamhyrTree.py -- Pamhyr abstract table model
+# Copyright (C) 2023-2026  INRAE
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# -*- coding: utf-8 -*-
+
+import logging
+import traceback
+
+from tools import trace, timer
+
+from Model.Except import NotImplementedMethodeError
+
+from PyQt5.QtCore import (
+    Qt, QVariant, QAbstractItemModel,
+    QCoreApplication, QModelIndex, pyqtSlot,
+)
+
+from PyQt5.QtWidgets import (
+    QTreeWidget, QTreeWidgetItem,
+)
+
+logger = logging.getLogger()
+
+
+class PamhyrModelRoot(QTreeWidgetItem):
+    def __init__(self, parent=None):
+        super(PamhyrModelRoot, self).__init__(
+            parent, ["Root"],
+        )
+
+class PamhyrModelItem(QTreeWidgetItem):
+    def __init__(self, data=None, trad=None, parent=None):
+        self._data = data
+        self._name = self._get_name()
+
+        super(PamhyrModelItem, self).__init__(
+            parent, [self._name],
+        )
+
+        self._setup_children()
+
+    def _get_name(self):
+        return str(self._data)
+
+    def _setup_children(self):
+        return
+
+
+class PamhyrModelListItem(QTreeWidgetItem):
+    def __init__(self, name=None, lst=None,
+                 child_item_ctor=PamhyrModelItem,
+                 trad=None, parent=None):
+        super(PamhyrModelListItem, self).__init__(
+            parent, [name],
+        )
+
+        self._name = name
+        self._lst = lst
+        self._trad = trad
+        self._child_item_ctor = child_item_ctor
+
+        self._setup_children()
+
+    def _setup_children(self):
+        for el in self._lst.lst:
+            self.addChild(
+                self._child_item_ctor(
+                    data=el, trad=self._trad, parent=self
+                )
+            )