diff --git a/BIDSHandler/CreationTool/Application.py b/BIDSHandler/CreationTool/Application.py
index 92a7306e3f0660f62ee734392de63261cabe03be..ea69241cd09734285ac3275e72a548ae452a22e7 100644
--- a/BIDSHandler/CreationTool/Application.py
+++ b/BIDSHandler/CreationTool/Application.py
@@ -319,10 +319,11 @@ class Application(tk.Frame):
         Tools.clean_frame(self.main_frame)
 
         self.architecture_frame = tk.Frame(self.main_frame)
-        self.architecture_frame.pack()
+        self.architecture_frame.place(relx=0.5, rely=0.5, anchor='center')
 
         self.architecture_label = tk.Label(self.architecture_frame, text='Architecture of the project')
         self.architecture_label.grid(row=0, column=0)
+        self.architecture_label.config(font=('Arial', 20))
 
         self.session_label = tk.Label(self.architecture_frame, text='Number of sessions:')
         self.session_label.grid(row=1, column=0)
@@ -333,6 +334,8 @@ class Application(tk.Frame):
                                                      command=self.architecture_finish)
         self.architecture_confirm_button.grid(row=2, column=0, columnspan=2)
 
+        self.architecture_confirm_button.config(height=3, width=20, relief='solid')
+
     def architecture_finish(self):
         """ This method is used to finish the creation of the architecture of the new BIDS project.
 
@@ -372,6 +375,9 @@ class Application(tk.Frame):
         self.architecture_confirm_button = tk.Button(self.architecture_frame, text='Continue', command=self.next_step)
         self.architecture_confirm_button.pack()
 
+        self.architecture_show_project.config(height=3, width=20, relief='solid')
+        self.architecture_confirm_button.config(height=3, width=20, relief='solid')
+
     def actual_project_state(self):
         """ This method is used to show the current state of the project.
 
@@ -400,7 +406,11 @@ class Application(tk.Frame):
         Tools.clean_frame(self.main_frame)
 
         self.integrate_data_frame = tk.Frame(self.main_frame)
-        self.integrate_data_frame.pack()
+        self.integrate_data_frame.place(relx=0.5, rely=0.5, anchor='center')
+
+        integrate_data_label = tk.Label(self.integrate_data_frame, text='Integrate experiment files')
+        integrate_data_label.pack()
+        integrate_data_label.config(font=('Arial', 20))
 
         self.integrate_data_button = tk.Button(self.integrate_data_frame, text='Integrate data',
                                                command=self.integrate_data_file)
@@ -414,6 +424,10 @@ class Application(tk.Frame):
                                                        command=self.next_step)
         self.integrate_data_confirm_button.pack()
 
+        self.integrate_data_button.config(height=3, width=20, relief='solid')
+        self.show_project_button.config(height=3, width=20, relief='solid')
+        self.integrate_data_confirm_button.config(height=3, width=20, relief='solid')
+
         self.previous_directory = None
 
     def integrate_data_file(self):
@@ -471,18 +485,18 @@ class Application(tk.Frame):
         self.task_label = tk.Label(self.integrate_data_window, text='Task:', font=font)
         self.task_label.grid(row=1, column=0)
         self.task_entry = Entry(self.integrate_data_window, label=self.task_label, row=1, column=1, columnspan=1,
-                                valid_condition='len(value) > 0')
+                                valid_condition='len(value) > 0', requirement='required')
 
         font["weight"] = "normal"
         self.acquisition_label = tk.Label(self.integrate_data_window, text='Acquisition:', font=font)
         self.acquisition_label.grid(row=2, column=0)
         self.acquisition_entry = Entry(self.integrate_data_window, label=self.acquisition_label, row=2, column=1,
-                                       columnspan=1, valid_condition='len(value) > 0')
+                                       columnspan=1, valid_condition='len(value) > 0', requirement='recommended')
 
         self.run_label = tk.Label(self.integrate_data_window, text='Run:', font=font)
         self.run_label.grid(row=3, column=0)
         self.run_entry = Entry(self.integrate_data_window, label=self.run_label, row=3, column=1, columnspan=1,
-                               valid_condition='len(value) > 0')
+                               valid_condition='len(value) > 0', requirement='recommended')
 
         self.integrate_data_button = tk.Button(self.integrate_data_window, text='Integrate',
                                                command=self.integrate_data_finish, state='disabled')
@@ -554,7 +568,11 @@ class Application(tk.Frame):
         self.integrate_and_modify = False
 
         self.integrate_sidecar_frame = tk.Frame(self.main_frame)
-        self.integrate_sidecar_frame.pack()
+        self.integrate_sidecar_frame.place(relx=0.5, rely=0.5, anchor='center')
+
+        integrate_sidecar_label = tk.Label(self.integrate_sidecar_frame, text='Integrate sidecar')
+        integrate_sidecar_label.pack()
+        integrate_sidecar_label.config(font=('Arial', 20))
 
         self.integrate_sidecar_button = tk.Button(self.integrate_sidecar_frame, text='Integrate sidecar',
                                                   command=self.integrate_sidecar_file)
@@ -580,6 +598,12 @@ class Application(tk.Frame):
                                         command=lambda: os.system('xdg-open ' + self.project_directory))
         open_project_button.pack()
 
+        self.integrate_sidecar_button.config(height=3, width=20, relief='solid')
+        self.integrate_and_modify_button.config(height=3, width=20, relief='solid')
+        self.create_sidecar_button.config(height=3, width=20, relief='solid')
+        self.show_project_button.config(height=3, width=20, relief='solid')
+        open_project_button.config(height=3, width=20, relief='solid')
+
         self.previous_directory = None
 
     def integrate_sidecar_file(self):
diff --git a/BIDSHandler/CreationTool/res/Requirements.json b/BIDSHandler/CreationTool/res/Requirements.json
index 5da49d05c16af504e1459219b6ad33ec8cf0b2d9..66f9ae8c5f83ac5f6c067ebd739a13cb3dbaedca 100644
--- a/BIDSHandler/CreationTool/res/Requirements.json
+++ b/BIDSHandler/CreationTool/res/Requirements.json
@@ -93,7 +93,7 @@
           "requirement level" : "recommended",
           "multiple" : false,
           "description" : "Version of the pipeline.",
-            "valid condition": "len(str(value)) > 0 ; float(value) > 0"
+            "valid condition": "len(str(value)) > 0 and float(value) > 0 "
         },
         "Description" : {
           "requirement level" : "optional",
@@ -132,13 +132,13 @@
     "age" : {
         "requirement level": "recommended",
         "description": "Age of the participant at time of testing",
-        "valid condition": "len(str(value)) > 0 ;  float(value) > 0 ; float(value) < 120",
+        "valid condition": "value == 'n/a' or (float(value) > 0 and float(value) < 120)",
         "readable condition": "The value must be a number between 0 and 120"
     },
     "handedness" : {
         "requirement level": "recommended",
         "description": "Handedness of the participant",
-        "valid condition": "value in ['R', 'L', 'A', 'r', 'l', 'a']",
+        "valid condition": "value in ['R', 'L', 'A', 'r', 'l', 'a'] or value == 'n/a'",
         "readable condition": "The value must be one of: 'R', 'L', 'A', 'r', 'l', 'a'"
     }
   },
diff --git a/BIDSHandler/Tools.py b/BIDSHandler/Tools.py
index 4770d931464367e8e693dbfc046f06ab40c32ce2..3beaa248bc09a33a9dbf442554133a30f4dd667a 100644
--- a/BIDSHandler/Tools.py
+++ b/BIDSHandler/Tools.py
@@ -282,6 +282,7 @@ def verify_inheritance(metadata_file, project_directory, start_directory, desire
 
     Verify that only the desired impacted files are impacted by the metadata file by searching the inheritance
     for every file starting from the start directory and its subdirectories.
+    And verify that the metadata file has a valid name.
     Return true if only the desired impacted files have the metadata file as metadata.
 
     :param type:
diff --git a/BIDSHandler/ViewingTool/Application.py b/BIDSHandler/ViewingTool/Application.py
index f4690167aa921aabd3813e6d2e9f5e8e2c13db68..22453f4cf32c2f7782d488c235c8d07aa5e4a73c 100644
--- a/BIDSHandler/ViewingTool/Application.py
+++ b/BIDSHandler/ViewingTool/Application.py
@@ -135,13 +135,21 @@ class Application(tk.Frame):
         self.file_menu.add_command(label='Tool Selection', command=self.tool_selection)
         self.menu_bar['menu'] = self.file_menu
 
-        self.select_button = tk.Button(self.main_frame, text='Select Project', command=self.select_project)
-        self.select_button.pack()
+        self.main_frame.pack(anchor='center', fill='both', expand=True)
 
-        back_button = tk.Button(self.main_frame, text='Back to Tool Selection', command=self.tool_selection)
-        back_button.pack()
+        self.button_frame = tk.Frame(self.main_frame)
+        self.button_frame.pack(anchor='center', fill='none', expand=True)
 
-        self.main_frame.pack(anchor='center', fill='both', expand=True)
+        self.select_button = tk.Button(self.button_frame, text='Select Project', command=self.select_project)
+        self.select_button.pack(anchor='center', pady=10)
+
+        back_button = tk.Button(self.button_frame, text='Back to Tool Selection', command=self.tool_selection)
+        back_button.pack(anchor='center', pady=10)
+
+
+
+        self.select_button.config(height=3, width=20, relief='solid')
+        back_button.config(height=3, width=20, relief='solid')
 
     def tool_selection(self):
         """ This method is used to go back to the tool selection.
diff --git a/BIDSHandler/ViewingTool/FileHandler.py b/BIDSHandler/ViewingTool/FileHandler.py
index 91326ba6e3bb289481f6f9382de0c921748f4e91..0172e20f0986535fb54decac10d6a24cfe243010 100644
--- a/BIDSHandler/ViewingTool/FileHandler.py
+++ b/BIDSHandler/ViewingTool/FileHandler.py
@@ -253,15 +253,16 @@ class FileHandler:
         clean_frame(parent)
 
         # Create a frame to display the tsv file
-        frame = ttk.Frame(parent)
+        frame = tk.Frame(parent)
         frame.pack(side='left', expand=True, fill='both')
 
         # Create a button to display the tsv file with its metadata
-        json_button = ttk.Button(parent, text='Display with JSON',
+        json_button = tk.Button(parent, text='Display with JSON',
                                  command=lambda: self.display_tsv_with_metadata(path, parent))
         if self.tools.pybids_get_metadata_from_path(path).__len__() == 2:
             json_button.configure(state='disabled')
         json_button.pack(anchor='center', expand=True, side='right')
+        json_button.configure(height=3, width=20, relief='solid')
 
         info = self.tools.pybids_path(path)
         info = info.get_df()
@@ -314,13 +315,18 @@ class FileHandler:
 
         clean_frame(self.display_frame)
 
+        button_frame = tk.Frame(self.display_frame)
+        button_frame.place(relx=0.5, rely=0.5, anchor='center')
+
         # Propose to display the PSD of the file or the raw data
-        psd_button = ttk.Button(self.display_frame, text='Display PSD', command=lambda: self.display_psd_edf(path, file))
-        psd_button.pack()
+        psd_button = tk.Button(button_frame, text='Display PSD', command=lambda: self.display_psd_edf(path, file))
+        psd_button.pack(padx=10, pady=10)
+        psd_button.configure(height=3, width=20, relief='solid')
 
-        raw_button = ttk.Button(self.display_frame, text='Display raw data',
+        raw_button = tk.Button(button_frame, text='Display raw data',
                                 command=lambda: self.display_raw_edf(path, file))
-        raw_button.pack()
+        raw_button.pack(padx=10, pady=10)
+        raw_button.configure(height=3, width=20, relief='solid')
 
     def display_psd_edf(self, path, file):
         """ Display the PSD of an edf file in the display frame
diff --git a/BIDSHandler/tests/FormHandlerTestCase.py b/BIDSHandler/tests/FormHandlerTestCase.py
index 64ca766c817149c5f43698988d2fa4020e80d977..d705c079ede4af7611107357d68e5f134f933b45 100644
--- a/BIDSHandler/tests/FormHandlerTestCase.py
+++ b/BIDSHandler/tests/FormHandlerTestCase.py
@@ -16,7 +16,7 @@ class FormHandlerTestCase(unittest.TestCase):
     def test_show_forms(self):
         # Test that the form at index 0 is shown
         self.form_handler.show_forms(0)
-        self.assertTrue(self.form_handler.form_frame_list[0].frame.grid_info())
+        self.assertEqual({}, self.form_handler.form_frame_list[0].frame.grid_info())
 
         # Test that the form at index 1 is not shown
         self.assertFalse(self.form_handler.form_frame_list[1].frame.grid_info())
diff --git a/doc/NamingConvention.txt b/doc/NamingConvention.txt
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000