diff --git a/backend/.idea/workspace.xml b/backend/.idea/workspace.xml
index 9e500e1..26b0173 100644
--- a/backend/.idea/workspace.xml
+++ b/backend/.idea/workspace.xml
@@ -5,13 +5,8 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="3a869f59-290a-4ab2-b036-a878ce801bc4" name="Changes" comment="Define Entity BasicTaskSchedule and Taskcontroller">
-      <change afterPath="$PROJECT_DIR$/src/main/java/core/api/models/timemanager/taskSchedule/BasicTaskScheduleEntityInfo.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/core/api/models/timemanager/taskSchedule/BasicTaskScheduleFieldInfo.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/core/repositories/timemanager/BasicTaskScheduleRepository.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/core/services/TaskScheduleService.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/core/api/controller/ScheduleController.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/api/controller/ScheduleController.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/core/api/controller/TaskController.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/api/controller/TaskController.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/core/api/models/timemanager/tasks/TaskEntityInfo.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/api/models/timemanager/tasks/TaskEntityInfo.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/main/java/core/entities/timemanager/Task.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/entities/timemanager/Task.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
@@ -48,31 +43,31 @@
     <option name="hideEmptyMiddlePackages" value="true" />
     <option name="showLibraryContents" value="true" />
   </component>
-  <component name="PropertiesComponent"><![CDATA[{
-  "keyToString": {
-    "RequestMappingsPanelOrder0": "0",
-    "RequestMappingsPanelOrder1": "1",
-    "RequestMappingsPanelWidth0": "75",
-    "RequestMappingsPanelWidth1": "75",
-    "RunOnceActivity.OpenProjectViewOnStart": "true",
-    "RunOnceActivity.ShowReadmeOnStart": "true",
-    "WebServerToolWindowFactoryState": "false",
-    "git-widget-placeholder": "issue-11-angular-update",
-    "last_directory_selection": "D:/Programmierprojekte/TimeManager/backend/src/main/java/core/api/models/timemanager",
-    "last_opened_file_path": "D:/Programmierprojekte/Dicewars/client",
-    "node.js.detected.package.eslint": "true",
-    "node.js.detected.package.tslint": "true",
-    "node.js.selected.package.eslint": "(autodetect)",
-    "node.js.selected.package.tslint": "(autodetect)",
-    "settings.editor.selected.configurable": "swagger",
-    "vue.rearranger.settings.migration": "true"
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;RequestMappingsPanelOrder0&quot;: &quot;0&quot;,
+    &quot;RequestMappingsPanelOrder1&quot;: &quot;1&quot;,
+    &quot;RequestMappingsPanelWidth0&quot;: &quot;75&quot;,
+    &quot;RequestMappingsPanelWidth1&quot;: &quot;75&quot;,
+    &quot;RunOnceActivity.OpenProjectViewOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;WebServerToolWindowFactoryState&quot;: &quot;false&quot;,
+    &quot;git-widget-placeholder&quot;: &quot;issue-11-angular-update&quot;,
+    &quot;last_directory_selection&quot;: &quot;D:/Programmierprojekte/TimeManager/backend/src/main/java/core/api/models/timemanager&quot;,
+    &quot;last_opened_file_path&quot;: &quot;D:/Programmierprojekte/Dicewars/client&quot;,
+    &quot;node.js.detected.package.eslint&quot;: &quot;true&quot;,
+    &quot;node.js.detected.package.tslint&quot;: &quot;true&quot;,
+    &quot;node.js.selected.package.eslint&quot;: &quot;(autodetect)&quot;,
+    &quot;node.js.selected.package.tslint&quot;: &quot;(autodetect)&quot;,
+    &quot;settings.editor.selected.configurable&quot;: &quot;swagger&quot;,
+    &quot;vue.rearranger.settings.migration&quot;: &quot;true&quot;
   },
-  "keyToStringList": {
-    "DatabaseDriversLRU": [
-      "mariadb"
+  &quot;keyToStringList&quot;: {
+    &quot;DatabaseDriversLRU&quot;: [
+      &quot;mariadb&quot;
     ]
   }
-}]]></component>
+}</component>
   <component name="RunManager">
     <configuration name="DemoApplication" type="SpringBootApplicationConfigurationType" factoryName="Spring Boot" nameIsGenerated="true">
       <module name="demo" />
@@ -99,7 +94,8 @@
       <workItem from="1697958018921" duration="91000" />
       <workItem from="1697958118995" duration="5749000" />
       <workItem from="1697969480767" duration="6407000" />
-      <workItem from="1697989716016" duration="3813000" />
+      <workItem from="1697989716016" duration="3814000" />
+      <workItem from="1698067098771" duration="307000" />
     </task>
     <task id="LOCAL-00001" summary="Structure Taskgroups in Hierarchies">
       <option name="closed" value="true" />
diff --git a/backend/src/main/java/core/api/models/timemanager/tasks/TaskEntityInfo.java b/backend/src/main/java/core/api/models/timemanager/tasks/TaskEntityInfo.java
index 4930205..6fb9121 100644
--- a/backend/src/main/java/core/api/models/timemanager/tasks/TaskEntityInfo.java
+++ b/backend/src/main/java/core/api/models/timemanager/tasks/TaskEntityInfo.java
@@ -20,6 +20,8 @@ public class TaskEntityInfo {
 
     private boolean finished;
 
+    private int workTime;
+
     public TaskEntityInfo(Task task) {
         this.taskID = task.getTaskID();
         this.taskName = task.getTaskName();
@@ -28,6 +30,7 @@ public class TaskEntityInfo {
         this.deadline = task.getDeadline();
         this.overdue = LocalDate.now().isAfter(task.getDeadline());
         this.finished = task.isFinished();
+        this.workTime = task.getWorkTime();
     }
 
     public long getTaskID() {
@@ -85,4 +88,12 @@ public class TaskEntityInfo {
     public void setFinished(boolean finished) {
         this.finished = finished;
     }
+
+    public int getWorkTime() {
+        return workTime;
+    }
+
+    public void setWorkTime(int workTime) {
+        this.workTime = workTime;
+    }
 }
diff --git a/backend/src/main/java/core/entities/timemanager/Task.java b/backend/src/main/java/core/entities/timemanager/Task.java
index aa8a9f4..61f07d7 100644
--- a/backend/src/main/java/core/entities/timemanager/Task.java
+++ b/backend/src/main/java/core/entities/timemanager/Task.java
@@ -29,6 +29,8 @@ public class Task {
     @OneToMany(mappedBy = "task", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
     private Set<BasicTaskSchedule> basicTaskSchedules;
 
+    private int workTime;
+
     public Task(Taskgroup taskgroup, String taskName, LocalDate startDate, LocalDate deadline, int eta) {
         this.taskgroup = taskgroup;
         this.taskName = taskName;
@@ -97,6 +99,18 @@ public class Task {
         this.finished = finished;
     }
 
+    public int getWorkTime() {
+        return workTime;
+    }
+
+    public void setWorkTime(int workTime) {
+        this.workTime = workTime;
+    }
+
+    public void addWorkTime(int workTime) {
+        this.workTime += workTime;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
diff --git a/frontend/src/api/model/basicScheduleEntityInfo.ts b/frontend/src/api/model/basicScheduleEntityInfo.ts
index 4bcb434..794d1ff 100644
--- a/frontend/src/api/model/basicScheduleEntityInfo.ts
+++ b/frontend/src/api/model/basicScheduleEntityInfo.ts
@@ -23,10 +23,14 @@ export interface BasicScheduleEntityInfo {
     /**
      * date on which the task schedule was started
      */
-    startTime: string;
+    startTime?: string;
     /**
      * date on which the tasks schedule was finished
      */
-    finishedTime: string;
+    finishedTime?: string;
+    /**
+     * number in minutes that the schedule was active
+     */
+    activeTime?: number;
 }
 
diff --git a/frontend/src/api/model/taskEntityInfo.ts b/frontend/src/api/model/taskEntityInfo.ts
index ec68fa9..a4bab1f 100644
--- a/frontend/src/api/model/taskEntityInfo.ts
+++ b/frontend/src/api/model/taskEntityInfo.ts
@@ -40,5 +40,9 @@ export interface TaskEntityInfo {
      * determines whether the task is finished
      */
     finished: boolean;
+    /**
+     * number in minutes that was already worked on this task
+     */
+    workTime: number;
 }
 
diff --git a/frontend/src/app/app-routing.module.ts b/frontend/src/app/app-routing.module.ts
index 14d95c1..a3778b1 100644
--- a/frontend/src/app/app-routing.module.ts
+++ b/frontend/src/app/app-routing.module.ts
@@ -6,6 +6,7 @@ import {MainComponent} from "./main/main.component";
 import {UserSettingsComponent} from "./user-settings/user-settings.component";
 import {TaskgroupDashboardComponent} from "./taskgroups/taskgroup-dashboard/taskgroup-dashboard.component";
 import {TaskDetailOverviewComponent} from "./tasks/task-detail-overview/task-detail-overview.component";
+import {SchedulerComponent} from "./schedules/scheduler/scheduler.component";
 
 const routes: Routes = [
   {path: '', component: MainComponent},
@@ -13,7 +14,8 @@ const routes: Routes = [
   {path: 'user/settings', component: UserSettingsComponent},
   {path: 'taskgroups', component: TaskgroupDashboardComponent},
   {path: 'taskgroups/:taskgroupID', component: TaskgroupDashboardComponent},
-  {path: 'taskgroups/:taskgroupID/tasks/:taskID', component: TaskDetailOverviewComponent}
+  {path: 'taskgroups/:taskgroupID/tasks/:taskID', component: TaskDetailOverviewComponent},
+  {path: 'taskgroups/:taskgroupID/tasks/:taskID/schedule', component: SchedulerComponent}
 ];
 
 @NgModule({
diff --git a/frontend/src/app/app.module.ts b/frontend/src/app/app.module.ts
index a0a7517..e4aaf42 100644
--- a/frontend/src/app/app.module.ts
+++ b/frontend/src/app/app.module.ts
@@ -56,6 +56,7 @@ import { NavigationLinkListComponent } from './navigation-link-list/navigation-l
 import { TaskDetailOverviewComponent } from './tasks/task-detail-overview/task-detail-overview.component';
 import {MatProgressBarModule} from "@angular/material/progress-bar";
 import {MatExpansionModule} from "@angular/material/expansion";
+import { SchedulerComponent } from './schedules/scheduler/scheduler.component';
 
 @NgModule({
   declarations: [
@@ -80,7 +81,8 @@ import {MatExpansionModule} from "@angular/material/expansion";
     TaskDashboardComponent,
     ClearTaskDialogComponent,
     NavigationLinkListComponent,
-    TaskDetailOverviewComponent
+    TaskDetailOverviewComponent,
+    SchedulerComponent
   ],
   imports: [
     BrowserModule,
diff --git a/frontend/src/app/tasks/task-detail-overview/task-detail-overview.component.html b/frontend/src/app/tasks/task-detail-overview/task-detail-overview.component.html
index 66875ad..c1f1766 100644
--- a/frontend/src/app/tasks/task-detail-overview/task-detail-overview.component.html
+++ b/frontend/src/app/tasks/task-detail-overview/task-detail-overview.component.html
@@ -14,7 +14,7 @@
     </mat-card-header>
     <mat-card-content>
       <p>ETA: {{task!.eta}} Minuten - Deadline: {{task!.deadline}}</p>
-      <mat-progress-bar [mode]="'determinate'" value="40"></mat-progress-bar>
+      <mat-progress-bar [mode]="'determinate'" [value]="task!.workTime"></mat-progress-bar>
     </mat-card-content>
     <mat-card-actions>
       <div style="width: 100%">
@@ -38,7 +38,7 @@
   <mat-expansion-panel>
     <mat-expansion-panel-header>Schedules</mat-expansion-panel-header>
     <div>
-      <button style="float: right" mat-raised-button color="primary">Add</button>
+      <button style="float: right" mat-raised-button color="primary" [routerLink]="['/taskgroups', taskgroup!.taskgroupID, 'tasks', task!.taskID, 'schedule']">Add</button>
     </div>
   </mat-expansion-panel>
 </div>
diff --git a/openapi.yaml b/openapi.yaml
index b61ca75..ca9e1d4 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -1462,6 +1462,7 @@ components:
         - deadline
         - overdue
         - finished
+        - workTime
       additionalProperties: false
       properties:
         taskID:
@@ -1493,6 +1494,10 @@ components:
           type: boolean
           description: determines whether the task is finished
           example: True
+        workTime:
+          type: number
+          description: number in minutes that was already worked on this task
+          example: 10
     TaskFieldInfo:
       required:
         - taskName
@@ -1522,8 +1527,6 @@ components:
       required:
         - scheduleID
         - scheduleDate
-        - startTime
-        - finishedTime
       additionalProperties: false
       properties:
         scheduleID:
@@ -1542,6 +1545,10 @@ components:
           type: string
           format: date-time
           description: date on which the tasks schedule was finished
+        activeTime: 
+          type: number
+          description: number in minutes that the schedule was active
+          example: 10
     BasicScheduleFieldInfo:
       required:
         - scheduleDate