diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index c4911cc82..ecc93f8b4 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -22,6 +22,12 @@ import { AboutUsComponent } from './component/about-us/about-us.component';
 import { DependencyGraphComponent } from './component/dependency-graph/dependency-graph.component';
 import { TeamsComponent } from './component/teams/teams.component';
 import { ToStringValuePipe } from './pipe/to-string-value.pipe';
+import { ModalMessageComponent } from './component/modal-message/modal-message.component';
+import {
+  MatDialogModule,
+  MAT_DIALOG_DATA,
+  MatDialogRef,
+} from '@angular/material/dialog';
 
 @NgModule({
   declarations: [
@@ -40,16 +46,23 @@ import { ToStringValuePipe } from './pipe/to-string-value.pipe';
     TeamsComponent,
     ToStringValuePipe,
     UserdayComponent,
+    ModalMessageComponent,
   ],
   imports: [
     BrowserModule,
     AppRoutingModule,
     BrowserAnimationsModule,
     MaterialModule,
+    MatDialogModule,
     ReactiveFormsModule,
     HttpClientModule,
   ],
-  providers: [ymlService],
+  providers: [
+    ymlService,
+    ModalMessageComponent,
+    { provide: MAT_DIALOG_DATA, useValue: {} },
+    { provide: MatDialogRef, useValue: { close: (dialogResult: any) => {} } },
+  ],
   bootstrap: [AppComponent],
 })
 export class AppModule {}
diff --git a/src/app/component/circular-heatmap/circular-heatmap.component.html b/src/app/component/circular-heatmap/circular-heatmap.component.html
index 6e6347d93..43ba21b35 100644
--- a/src/app/component/circular-heatmap/circular-heatmap.component.html
+++ b/src/app/component/circular-heatmap/circular-heatmap.component.html
@@ -284,8 +284,8 @@ <h2>Nothing to show</h2>
           class="normal-button"
           mat-raised-button
           class="resetButtonClass"
-          (click)="ResetIsImplemented()">
-          Reset Implemented
+          (click)="deleteLocalTeamsProgress()">
+          Delete team progress
         </button>
       </div>
     </div>
diff --git a/src/app/component/circular-heatmap/circular-heatmap.component.spec.ts b/src/app/component/circular-heatmap/circular-heatmap.component.spec.ts
index a1d1515d0..cb10751cb 100644
--- a/src/app/component/circular-heatmap/circular-heatmap.component.spec.ts
+++ b/src/app/component/circular-heatmap/circular-heatmap.component.spec.ts
@@ -4,6 +4,7 @@ import { ymlService } from 'src/app/service/yaml-parser/yaml-parser.service';
 import { CircularHeatmapComponent } from './circular-heatmap.component';
 import { RouterTestingModule } from '@angular/router/testing';
 import { MatChip } from '@angular/material/chips';
+import { ModalMessageComponent } from '../modal-message/modal-message.component';
 
 describe('CircularHeatmapComponent', () => {
   let component: CircularHeatmapComponent;
@@ -11,19 +12,17 @@ describe('CircularHeatmapComponent', () => {
 
   beforeEach(async () => {
     await TestBed.configureTestingModule({
-      providers: [ymlService, HttpClient, HttpHandler],
+      declarations: [CircularHeatmapComponent, MatChip],
       imports: [RouterTestingModule],
-      declarations: [CircularHeatmapComponent],
+      providers: [
+        ymlService,
+        HttpClient,
+        HttpHandler,
+        { provide: ModalMessageComponent, useValue: {} },
+      ],
     }).compileComponents();
-  });
-  beforeEach(async () => {
-    TestBed.configureTestingModule({
-      declarations: [MatChip],
-    }).compileComponents();
-  });
 
-  beforeEach(() => {
-    fixture = TestBed.createComponent(CircularHeatmapComponent);
+    fixture = TestBed.createComponent(CircularHeatmapComponent); // Create fixture and component here
     component = fixture.componentInstance;
     fixture.detectChanges();
   });
diff --git a/src/app/component/circular-heatmap/circular-heatmap.component.ts b/src/app/component/circular-heatmap/circular-heatmap.component.ts
index 9a747b519..fa5e33da0 100644
--- a/src/app/component/circular-heatmap/circular-heatmap.component.ts
+++ b/src/app/component/circular-heatmap/circular-heatmap.component.ts
@@ -11,6 +11,10 @@ import * as yaml from 'js-yaml';
 import { Router } from '@angular/router';
 import { MatChip } from '@angular/material/chips';
 import * as md from 'markdown-it';
+import {
+  ModalMessageComponent,
+  DialogInfo,
+} from '../modal-message/modal-message.component';
 
 export interface activitySchema {
   uuid: string;
@@ -62,7 +66,7 @@ export class CircularHeatmapComponent implements OnInit {
   constructor(
     private yaml: ymlService,
     private router: Router,
-    private changeDetector: ChangeDetectorRef
+    public modal: ModalMessageComponent
   ) {
     this.showOverlay = false;
   }
@@ -83,6 +87,14 @@ export class CircularHeatmapComponent implements OnInit {
   @ViewChildren(MatChip) chips!: QueryList<MatChip>;
   matChipsArray: MatChip[] = [];
 
+  displayMessage(dialogInfo: DialogInfo) {
+    // Remove focus from the button that becomes aria unavailable (avoids ugly console error message)
+    const buttonElement = document.activeElement as HTMLElement;
+    buttonElement.blur();
+
+    this.modal.openDialog(dialogInfo);
+  }
+
   private LoadMaturityDataFromGeneratedYaml() {
     return new Promise<void>((resolve, reject) => {
       console.log(`${this.perfNow()}s: LoadMaturityData Fetch`);
@@ -843,9 +855,26 @@ export class CircularHeatmapComponent implements OnInit {
     this.noActivitytoGrey();
   }
 
-  ResetIsImplemented() {
-    localStorage.removeItem('dataset');
-    this.loadDataset();
+  deleteLocalTeamsProgress() {
+    // Remove focus from the button that becomes aria unavailable (avoids ugly console error message)
+    const buttonElement = document.activeElement as HTMLElement;
+    buttonElement.blur();
+
+    let title: string = 'Delete local browser data';
+    let message: string =
+      'Do you want to delete all progress for each team?' +
+      '\n\nThis deletes all progress stored in your local browser, but does ' +
+      'not change any progress stored in the yaml file on the server.';
+    let buttons: string[] = ['Cancel', 'Delete'];
+    this.modal
+      .openDialog({ title, message, buttons, template: '' })
+      .afterClosed()
+      .subscribe(data => {
+        if (data === 'Delete') {
+          localStorage.removeItem('dataset');
+          location.reload(); // Make sure all load routines are initialized
+        }
+      });
   }
 
   saveDataset() {
diff --git a/src/app/component/modal-message/modal-message.component.css b/src/app/component/modal-message/modal-message.component.css
new file mode 100644
index 000000000..375caf548
--- /dev/null
+++ b/src/app/component/modal-message/modal-message.component.css
@@ -0,0 +1,14 @@
+.dialog {
+    margin: 0.5em;
+    padding: 1em;
+}
+
+.dialog-buttons {
+    display: flex;
+    justify-content: flex-end;
+}
+
+button {
+    min-width: 5rem;
+    margin: 0 1rem;
+}
\ No newline at end of file
diff --git a/src/app/component/modal-message/modal-message.component.html b/src/app/component/modal-message/modal-message.component.html
new file mode 100644
index 000000000..f1ff005f7
--- /dev/null
+++ b/src/app/component/modal-message/modal-message.component.html
@@ -0,0 +1,14 @@
+<div mat-dialog-content class="dialog">
+  <h2 mat-dialog-title>{{ data.title }}</h2>
+  <p [innerHTML]="data.message"></p>
+</div>
+<div mat-dialog-actions class="dialog-buttons">
+  <button
+    *ngFor="let name of data.buttons"
+    mat-button
+    mat-dialog-close
+    class="mat-focus-indicator downloadButtonClass mat-raised-button mat-button-base"
+    (click)="closeDialog(name)">
+    {{ name }}
+  </button>
+</div>
diff --git a/src/app/component/modal-message/modal-message.component.spec.ts b/src/app/component/modal-message/modal-message.component.spec.ts
new file mode 100644
index 000000000..213ea3cb9
--- /dev/null
+++ b/src/app/component/modal-message/modal-message.component.spec.ts
@@ -0,0 +1,52 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+import { DialogInfo, ModalMessageComponent } from './modal-message.component';
+import { MatDialogRef, MAT_DIALOG_DATA } from '@angular/material/dialog';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+import { MatDialogModule } from '@angular/material/dialog';
+
+describe('ModalMessageComponent', () => {
+  let component: ModalMessageComponent;
+  let fixture: ComponentFixture<ModalMessageComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [NoopAnimationsModule, MatDialogModule],
+      declarations: [ModalMessageComponent],
+      providers: [
+        { provide: MatDialogRef, useValue: {} },
+        { provide: MAT_DIALOG_DATA, useValue: {} },
+      ],
+    }).compileComponents();
+  });
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ModalMessageComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+
+  it('should render markdown correctly in the dialog', () => {
+    const dialogInfo: DialogInfo = new DialogInfo('A **test** markdown.');
+    const dialogRef: MatDialogRef<ModalMessageComponent> =
+      component.openDialog(dialogInfo);
+
+    expect(dialogRef.componentInstance.data.message).toContain(
+      '<strong>test</strong>'
+    );
+  });
+
+  it('should render markdown correctly in the dialog', () => {
+    const dialogInfo: DialogInfo = new DialogInfo('A **test** markdown.');
+    const dialogRef: MatDialogRef<ModalMessageComponent> =
+      component.openDialog(dialogInfo);
+
+    // Check if markdown rendering is applied
+    expect(dialogRef.componentInstance.data.message).toContain(
+      '<strong>test</strong>'
+    );
+  });
+});
diff --git a/src/app/component/modal-message/modal-message.component.ts b/src/app/component/modal-message/modal-message.component.ts
new file mode 100644
index 000000000..2dbb00469
--- /dev/null
+++ b/src/app/component/modal-message/modal-message.component.ts
@@ -0,0 +1,87 @@
+import { Inject, Component, OnInit } from '@angular/core';
+import {
+  MAT_DIALOG_DATA,
+  MatDialogRef,
+  MatDialog,
+  MatDialogConfig,
+} from '@angular/material/dialog';
+import * as md from 'markdown-it';
+
+@Component({
+  selector: 'app-modal-message',
+  templateUrl: './modal-message.component.html',
+  styleUrls: ['./modal-message.component.css'],
+})
+export class ModalMessageComponent implements OnInit {
+  data: DialogInfo;
+  markdown: md = md();
+
+  DSOMM_host: string = 'https://github.com/devsecopsmaturitymodel';
+  DSOMM_url: string = `${this.DSOMM_host}/DevSecOps-MaturityModel-data`;
+  meassageTemplates: Record<string, DialogInfo> = {
+    generated_yaml: new DialogInfo(
+      `{message}\n\n` +
+        `Please download the activity template \`generated.yaml\` ` +
+        `from [DSOMM-data](${this.DSOMM_url}) on GitHub.\n\n` +
+        'The DSOMM activities are maintained and distributed ' +
+        'separately from the software.',
+      'DSOMM startup problems'
+    ),
+  };
+
+  constructor(
+    public dialog: MatDialog,
+    public dialogRef: MatDialogRef<ModalMessageComponent>,
+    @Inject(MAT_DIALOG_DATA) data: DialogInfo
+  ) {
+    this.data = data;
+  }
+
+  // eslint-disable-next-line @angular-eslint/no-empty-lifecycle-method
+  ngOnInit(): void {}
+
+  openDialog(
+    dialogInfo: DialogInfo | string
+  ): MatDialogRef<ModalMessageComponent> {
+    if (typeof dialogInfo === 'string') {
+      dialogInfo = new DialogInfo(dialogInfo);
+    }
+    if (
+      dialogInfo.template &&
+      this.meassageTemplates.hasOwnProperty(dialogInfo.template)
+    ) {
+      let template: DialogInfo = this.meassageTemplates[dialogInfo.template];
+      dialogInfo.title = dialogInfo.title || template?.title;
+      dialogInfo.message = template?.message?.replace(
+        '{message}',
+        dialogInfo.message
+      );
+    }
+
+    dialogInfo.message = this.markdown.render(dialogInfo.message);
+
+    const dialogConfig = new MatDialogConfig();
+    dialogConfig.id = 'modal-message';
+    dialogConfig.disableClose = true;
+    dialogConfig.data = dialogInfo;
+    dialogConfig.autoFocus = false;
+    this.dialogRef = this.dialog.open(ModalMessageComponent, dialogConfig);
+    return this.dialogRef;
+  }
+
+  closeDialog(buttonName: string) {
+    this.dialogRef?.close(buttonName);
+  }
+}
+
+export class DialogInfo {
+  title: string = '';
+  template: string | null = '';
+  message: string = '';
+  buttons: string[] = ['OK'];
+
+  constructor(msg: string = '', title: string = '') {
+    this.message = msg;
+    this.title = title;
+  }
+}