diff --git a/config/initializers/extends/notifcation_extends.rb b/config/initializers/extends/notifcation_extends.rb
new file mode 100644
index 000000000..6d0a7b9ba
--- /dev/null
+++ b/config/initializers/extends/notifcation_extends.rb
@@ -0,0 +1,155 @@
+class NotificationExtends
+  NOTIFICATIONS_TYPES = {
+    designate_user_to_my_module_activity: {
+      code: 13,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    undesignate_user_from_my_module_activity: {
+      code: 14,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    my_module_due_date_reminder: {
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    add_comment_to_module_activity: {
+      code: 35,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    edit_module_comment_activity: {
+      code: 36,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    delete_module_comment_activity: {
+      code: 37,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    add_comment_to_step_activity: {
+      code: 17,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    edit_step_comment_activity: {
+      code: 38,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    delete_step_comment_activity: {
+      code: 39,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    add_comment_to_result_activity: {
+      code: 24,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    edit_result_comment_activity: {
+      code: 40,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    delete_result_comment_activity: {
+      code: 41,
+      recipients_module: :MyModuleDesignatedRecipients
+    },
+    assign_user_to_project_activity: {
+      code: 5,
+      recipients_module: :AssignedRecipients
+    },
+    unassign_user_from_project_activity: {
+      code: 7,
+      recipients_module: :AssignedRecipients
+    },
+    project_grant_access_to_all_team_members_activity: {
+      code: 242,
+      recipients_module: :AssignedGroupRecipients
+    },
+    project_remove_access_from_all_team_members_activity: {
+      code: 243,
+      recipients_module: :AssignedGroupRecipients
+    },
+    change_user_role_on_project_activity: {
+      code: 6,
+      recipients_module: :AssignedRecipients
+    },
+    change_user_role_on_experiment_activity: {
+      code: 165,
+      recipients_module: :AssignedRecipients
+    },
+    change_user_role_on_my_module_activity: {
+      code: 166,
+      recipients_module: :AssignedRecipients
+    },
+    item_low_stock_reminder: {
+      recipients_module: :ItemCreatorRecipients
+    },
+    item_date_reminder: {
+      recipients_module: :ItemCreatorRecipients
+    },
+    smart_annotation_added: {
+      recipients_module: :AnnotatedRecipients
+    },
+    invite_user_to_team_activity: {
+      code: 92,
+      recipients_module: :AssignedRecipients
+    },
+    remove_user_from_team_activity: {
+      code: 93,
+      recipients_module: :AssignedRecipients
+    },
+    change_users_role_on_team_activity: {
+      code: 94,
+      recipients_module: :AssignedRecipients
+    }
+  }
+
+  NOTIFICATIONS_GROUPS = {
+    my_module: {
+      designation: %I[
+        designate_user_to_my_module_activity
+        undesignate_user_from_my_module_activity
+      ],
+      modified: %I[],
+      due_date: %I[
+        my_module_due_date_reminder
+      ],
+      comments: %I[
+        add_comment_to_module_activity
+        edit_module_comment_activity
+        delete_module_comment_activity
+        add_comment_to_step_activity
+        edit_step_comment_activity
+        delete_step_comment_activity
+        add_comment_to_result_activity
+        edit_result_comment_activity
+        delete_result_comment_activity
+      ]
+    },
+    project_experiment: {
+      access: %I[
+        assign_user_to_project_activity
+        unassign_user_from_project_activity
+        project_grant_access_to_all_team_members_activity
+        project_remove_access_from_all_team_members_activity
+      ],
+      role_change: %I[
+        change_user_role_on_project_activity
+        change_user_role_on_experiment_activity
+        change_user_role_on_my_module_activity
+      ]
+    },
+    repository: {
+      stock: %I[
+        item_low_stock_reminder
+      ],
+      date_reminder: %I[
+        item_date_reminder
+      ]
+    },
+    other: {
+      smart_annotation: %I[
+        smart_annotation_added
+      ],
+      team_invitation: %I[
+        invite_user_to_team_activity
+        remove_user_from_team_activity
+        change_users_role_on_team_activity
+      ]
+    }
+  }
+end
diff --git a/config/locales/notifications/en.yml b/config/locales/notifications/en.yml
new file mode 100644
index 000000000..73396ba19
--- /dev/null
+++ b/config/locales/notifications/en.yml
@@ -0,0 +1,23 @@
+en:
+  notifications:
+    groups:
+      my_module: "Task"
+      project_experiment: "Project & Experiment"
+      repository: "Inventories & Items"
+      other: "Others"
+    sub_groups:
+      my_module_designation: "You are assigned to or unassigned from a task"
+      my_module_modified: "There is a change on assigned task"
+      my_module_due_date: "Due date & time on assigned task  (24h before)"
+      my_module_comments: "A comment is added or changed on a task you are assigned to​"
+      project_experiment_access: "You are added or removed from the Project"
+      project_experiment_role_change: "Your role on Project, Experiment or Task is changed"
+      repository_stock: "A stock gets low (low stock reminder)"
+      repository_date_reminder: "Date reminder"
+      other_smart_annotation: "You are mentioned (tagged) in any place of Scinote"
+      other_team_invitation: "You are invited or removed from the team"
+    notification:
+      my_module_due_date_reminder_html: "Due date for %{my_module_name} is coming up"
+      item_low_stock_reminder_html: "Item %{repository_item_name} is running low"
+      item_date_reminder_html: "Date reminder for %{repository_item_name} is coming up in %{value} %{units}"
+