diff --git a/src/core/Thing.ts b/src/core/Thing.ts
index 24d0b1e5..8a204dce 100644
--- a/src/core/Thing.ts
+++ b/src/core/Thing.ts
@@ -44,6 +44,7 @@ export enum SCThingType {
   Setting = 'setting',
   SportCourse = 'sport course',
   Ticket = 'ticket',
+  ToDo = 'todo',
   Tour = 'tour',
   Video = 'video',
 }
diff --git a/src/core/things/Favorite.ts b/src/core/things/Favorite.ts
index cac53680..614b21c5 100644
--- a/src/core/things/Favorite.ts
+++ b/src/core/things/Favorite.ts
@@ -22,6 +22,7 @@ import {SCPersonWithoutReferences} from './Person';
 import {SCPointOfInterestWithoutReferences} from './PointOfInterest';
 import {SCRoomWithoutReferences} from './Room';
 import {SCSportCourseWithoutReferences} from './SportCourse';
+import {SCToDoWithoutReferences} from './ToDo';
 
 /**
  * Types that can be made a favorite (added as a favorite)
@@ -33,7 +34,8 @@ export type SCFavoriteDataTypes = SCAcademicEventWithoutReferences
   | SCPersonWithoutReferences
   | SCPointOfInterestWithoutReferences
   | SCRoomWithoutReferences
-  | SCSportCourseWithoutReferences;
+  | SCSportCourseWithoutReferences
+  | SCToDoWithoutReferences;
 
 /**
  * A favorite
diff --git a/src/core/things/ToDo.ts b/src/core/things/ToDo.ts
new file mode 100644
index 00000000..fd2d6a3f
--- /dev/null
+++ b/src/core/things/ToDo.ts
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2019 StApps
+ * 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, version 3.
+ *
+ * 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/>.
+ */
+import {SCThingWithCategoriesSpecificValues, SCThingWithCategoriesWithoutReferences} from '../base/ThingWithCategories';
+import {SCThingType} from '../Thing';
+import {SCISO8601Date} from '../types/Time';
+
+/**
+ * A "to do" without references
+ */
+export interface SCToDoWithoutReferences
+  extends SCThingWithCategoriesWithoutReferences<string, SCThingWithCategoriesSpecificValues> {
+  /**
+   * Whether or not the "to do" is already done
+   */
+  done: boolean;
+
+  /**
+   * A date when the "to do" is due
+   */
+  dueDate?: SCISO8601Date;
+
+  /**
+   * Priority of the "to do"
+   */
+  priority: SCToDoPriority;
+
+  /**
+   * Type of the "to do"
+   */
+  type: SCThingType.ToDo;
+}
+
+/**
+ * A "to do"
+ *
+ * @validatable
+ */
+export interface SCToDo extends SCToDoWithoutReferences {
+}
+
+/**
+ * A priority of a "to do"
+ */
+export enum SCToDoPriority {
+  LOW = 0,
+  NORMAL = 2,
+  HIGH = 5,
+}