diff --git a/backend/src/controllers/submissions.ts b/backend/src/controllers/submissions.ts
index 512ac22e..9ef2df6e 100644
--- a/backend/src/controllers/submissions.ts
+++ b/backend/src/controllers/submissions.ts
@@ -1,7 +1,8 @@
 import { Request, Response } from 'express';
 import { createSubmission, deleteSubmission, getSubmission } from '../services/submissions.js';
 import { Language, languageMap } from '../entities/content/language.js';
-import { SubmissionDTO } from '../interfaces/submission';
+
+import { SubmissionDTO } from 'dwengo-1-common/src/interfaces/submission';
 
 interface SubmissionParams {
     hruid: string;
diff --git a/backend/src/interfaces/submission.ts b/backend/src/interfaces/submission.ts
index 95afee70..9a506b27 100644
--- a/backend/src/interfaces/submission.ts
+++ b/backend/src/interfaces/submission.ts
@@ -1,27 +1,7 @@
 import { Submission } from '../entities/assignments/submission.entity.js';
-import { Language } from '../entities/content/language.js';
 import { mapToGroupDTO } from './group.js';
-import { mapToStudent, mapToStudentDTO, StudentDTO } from './student.js';
-import { LearningObjectIdentifier } from './learning-content.js';
-import { GroupDTO } from 'dwengo-1-common/src/interfaces/group';
-
-export interface SubmissionDTO {
-    learningObjectIdentifier: LearningObjectIdentifier;
-
-    submissionNumber?: number;
-    submitter: StudentDTO;
-    time?: Date;
-    group?: GroupDTO;
-    content: string;
-}
-
-export interface SubmissionDTOId {
-    learningObjectHruid: string;
-    learningObjectLanguage: Language;
-    learningObjectVersion: number;
-
-    submissionNumber?: number;
-}
+import { mapToStudent, mapToStudentDTO } from './student.js';
+import { SubmissionDTO, SubmissionDTOId } from 'dwengo-1-common/src/interfaces/submission';
 
 export function mapToSubmissionDTO(submission: Submission): SubmissionDTO {
     return {
diff --git a/backend/src/services/assignments.ts b/backend/src/services/assignments.ts
index 0d8807c5..278098bd 100644
--- a/backend/src/services/assignments.ts
+++ b/backend/src/services/assignments.ts
@@ -1,7 +1,8 @@
 import { getAssignmentRepository, getClassRepository, getGroupRepository, getSubmissionRepository } from '../data/repositories.js';
 import { mapToAssignment, mapToAssignmentDTO, mapToAssignmentDTOId } from '../interfaces/assignment.js';
-import { mapToSubmissionDTO, mapToSubmissionDTOId, SubmissionDTO, SubmissionDTOId } from '../interfaces/submission.js';
+import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { AssignmentDTO } from 'dwengo-1-common/src/interfaces/assignment';
+import { SubmissionDTO, SubmissionDTOId } from 'dwengo-1-common/src/interfaces/submission';
 
 export async function getAllAssignments(classid: string, full: boolean): Promise<AssignmentDTO[]> {
     const classRepository = getClassRepository();
diff --git a/backend/src/services/groups.ts b/backend/src/services/groups.ts
index df8f02b7..42c51c20 100644
--- a/backend/src/services/groups.ts
+++ b/backend/src/services/groups.ts
@@ -7,8 +7,9 @@ import {
 } from '../data/repositories.js';
 import { Group } from '../entities/assignments/group.entity.js';
 import { mapToGroupDTO, mapToGroupDTOId } from '../interfaces/group.js';
-import { mapToSubmissionDTO, mapToSubmissionDTOId, SubmissionDTO, SubmissionDTOId } from '../interfaces/submission.js';
+import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { GroupDTO } from 'dwengo-1-common/src/interfaces/group';
+import { SubmissionDTO, SubmissionDTOId } from 'dwengo-1-common/src/interfaces/submission';
 
 export async function getGroup(classId: string, assignmentNumber: number, groupNumber: number, full: boolean): Promise<GroupDTO | null> {
     const classRepository = getClassRepository();
diff --git a/backend/src/services/students.ts b/backend/src/services/students.ts
index b8ab4650..f8d92486 100644
--- a/backend/src/services/students.ts
+++ b/backend/src/services/students.ts
@@ -2,11 +2,12 @@ import { getClassRepository, getGroupRepository, getStudentRepository, getSubmis
 import { mapToClassDTO } from '../interfaces/class.js';
 import { mapToGroupDTO, mapToGroupDTOId } from '../interfaces/group.js';
 import { mapToStudent, mapToStudentDTO, StudentDTO } from '../interfaces/student.js';
-import { mapToSubmissionDTO, mapToSubmissionDTOId, SubmissionDTO, SubmissionDTOId } from '../interfaces/submission.js';
+import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { getAllAssignments } from './assignments.js';
 import { AssignmentDTO } from 'dwengo-1-common/src/interfaces/assignment';
 import { ClassDTO } from 'dwengo-1-common/src/interfaces/class';
 import { GroupDTO } from 'dwengo-1-common/src/interfaces/group';
+import { SubmissionDTO, SubmissionDTOId } from 'dwengo-1-common/src/interfaces/submission';
 
 export async function getAllStudents(full: boolean): Promise<StudentDTO[] | string[]> {
     const studentRepository = getStudentRepository();
diff --git a/backend/src/services/submissions.ts b/backend/src/services/submissions.ts
index 0e1ad9ac..0fa9811d 100644
--- a/backend/src/services/submissions.ts
+++ b/backend/src/services/submissions.ts
@@ -1,7 +1,8 @@
 import { getGroupRepository, getSubmissionRepository } from '../data/repositories.js';
 import { Language } from '../entities/content/language.js';
 import { LearningObjectIdentifier } from '../entities/content/learning-object-identifier.js';
-import { mapToSubmission, mapToSubmissionDTO, SubmissionDTO } from '../interfaces/submission.js';
+import { mapToSubmission, mapToSubmissionDTO } from '../interfaces/submission.js';
+import { SubmissionDTO } from 'dwengo-1-common/src/interfaces/submission';
 
 export async function getSubmission(
     learningObjectHruid: string,
diff --git a/common/src/interfaces/submission.d.ts b/common/src/interfaces/submission.d.ts
new file mode 100644
index 00000000..c4c2b35d
--- /dev/null
+++ b/common/src/interfaces/submission.d.ts
@@ -0,0 +1,19 @@
+import { GroupDTO } from './group';
+
+export interface SubmissionDTO {
+    learningObjectIdentifier: LearningObjectIdentifier;
+
+    submissionNumber?: number;
+    submitter: StudentDTO;
+    time?: Date;
+    group?: GroupDTO;
+    content: string;
+}
+
+export interface SubmissionDTOId {
+    learningObjectHruid: string;
+    learningObjectLanguage: Language;
+    learningObjectVersion: number;
+
+    submissionNumber?: number;
+}