diff --git a/src/models/entry.ts b/src/models/entry.ts
new file mode 100644
index 00000000..f5076b45
--- /dev/null
+++ b/src/models/entry.ts
@@ -0,0 +1,6 @@
+export abstract class Entry {
+    referenceId: string;
+    externalId: string;
+    creationDate: Date;
+    revisonDate: Date;
+}
diff --git a/src/models/groupEntry.ts b/src/models/groupEntry.ts
new file mode 100644
index 00000000..12169692
--- /dev/null
+++ b/src/models/groupEntry.ts
@@ -0,0 +1,7 @@
+import { Entry } from './entry';
+
+export class GroupEntry extends Entry {
+    name: string;
+    userMemberExternalIds = new Set<string>();
+    groupMemberReferenceIds = new Set<string>();
+}
diff --git a/src/models/ldapConfiguration.ts b/src/models/ldapConfiguration.ts
index ba8adb13..d853acfe 100644
--- a/src/models/ldapConfiguration.ts
+++ b/src/models/ldapConfiguration.ts
@@ -1,13 +1,13 @@
 import { DirectoryType } from '../enums/directoryType';
 
 export class LdapConfiguration {
-    ssl: boolean = false;
+    ssl = false;
     hostname: string;
-    port: number = 389;
+    port = 389;
     domain: string;
     rootPath: string;
-    currentUser: boolean = false;
+    currentUser = false;
     username: string;
     password: string;
-    ad: boolean = true;
+    ad = true;
 }
diff --git a/src/models/syncConfiguration.ts b/src/models/syncConfiguration.ts
index d0054779..87c8506d 100644
--- a/src/models/syncConfiguration.ts
+++ b/src/models/syncConfiguration.ts
@@ -1,10 +1,10 @@
 export class SyncConfiguration {
-    users: boolean = false;
-    groups: boolean = false;
-    interval: number = 5;
+    users = false;
+    groups = false;
+    interval = 5;
     userFilter: string;
     groupFilter: string;
-    removeDisabled: boolean = false;
+    removeDisabled = false;
     // Ldap properties
     groupObjectClass: string;
     userObjectClass: string;
@@ -13,7 +13,7 @@ export class SyncConfiguration {
     groupNameAttribute: string;
     userEmailAttribute: string;
     memberAttribute: string;
-    useEmailPrefixSuffix: boolean = false;
+    useEmailPrefixSuffix = false;
     emailPrefixAttribute: string;
     emailSuffix: string;
     creationDateAttribute: string;
diff --git a/src/models/userEntry.ts b/src/models/userEntry.ts
new file mode 100644
index 00000000..51c5e2b5
--- /dev/null
+++ b/src/models/userEntry.ts
@@ -0,0 +1,7 @@
+import { Entry } from './entry';
+
+export class UserEntry extends Entry {
+    email: string;
+    disabled = false;
+    deleted = false;
+}