diff --git a/src/app/components/experiment-timeline/experiment-timeline.component.html b/src/app/components/experiment-timeline/experiment-timeline.component.html
index b0990a2..29f24bd 100644
--- a/src/app/components/experiment-timeline/experiment-timeline.component.html
+++ b/src/app/components/experiment-timeline/experiment-timeline.component.html
@@ -53,6 +53,16 @@ <h1 class="t-page-headline align-arrow">Experiment Timeline</h1>
                 [value]="unclearedSubstepValue.value">{{unclearedSubstepValue.viewValue}}
             </mat-radio-button>
         </mat-radio-group>
+        <br>
+        <mat-form-field>
+            <mat-label>Result quality</mat-label>
+            <mat-select [(ngModel)]="resultQuality" (ngModelChange)="updatePageContent()">
+                <mat-option [value]="''">Not Selected</mat-option>
+                <mat-option *ngFor="let resultQualityValue of resultQualityValues"
+                    [value]="resultQualityValue">{{resultQualityValue.charAt(0).toUpperCase() + resultQualityValue.slice(1).toLowerCase()}}
+                </mat-option>
+            </mat-select>
+        </mat-form-field>
     </mat-expansion-panel>
 
     <div class="page-item-list">
diff --git a/src/app/components/experiment-timeline/experiment-timeline.component.ts b/src/app/components/experiment-timeline/experiment-timeline.component.ts
index ee92ff9..ed88c77 100644
--- a/src/app/components/experiment-timeline/experiment-timeline.component.ts
+++ b/src/app/components/experiment-timeline/experiment-timeline.component.ts
@@ -4,7 +4,7 @@ import { ActivatedRoute } from '@angular/router';
 import { Observable, Subscription, of } from 'rxjs';
 import { catchError, map } from 'rxjs/operators';
 import { CurrentExperimentService } from 'src/app/services/current-experiment.service';
-import { QhanaBackendService, TimelineStepApiObject } from 'src/app/services/qhana-backend.service';
+import { ExperimentResultQuality, ExperimentResultQualityValues, QhanaBackendService, TimelineStepApiObject } from 'src/app/services/qhana-backend.service';
 import { ServiceRegistryService } from 'src/app/services/service-registry.service';
 
 interface SelectValue {
@@ -50,6 +50,8 @@ export class ExperimentTimelineComponent implements OnInit, OnDestroy {
         { value: 1, viewValue: "Only steps with uncleared substeps" },
         { value: -1, viewValue: "Only steps with cleared substeps" }
     ];
+    resultQuality: ExperimentResultQuality | "" = "";
+    resultQualityValues = ExperimentResultQualityValues;
 
     constructor(private route: ActivatedRoute, private experiment: CurrentExperimentService, private backend: QhanaBackendService, private serviceRegistry: ServiceRegistryService) { }
 
@@ -99,6 +101,7 @@ export class ExperimentTimelineComponent implements OnInit, OnDestroy {
             version: this.version ?? "",
             stepStatus: this.stepStatus,
             unclearedSubstep: this.unclearedSubstep,
+            resultQuality: this.resultQuality,
         }).pipe(
             map(value => {
                 if (this.currentPage !== currentRequest) {
diff --git a/src/app/components/timeline-step/timeline-step.component.ts b/src/app/components/timeline-step/timeline-step.component.ts
index 27f5336..b2a7e40 100644
--- a/src/app/components/timeline-step/timeline-step.component.ts
+++ b/src/app/components/timeline-step/timeline-step.component.ts
@@ -4,7 +4,7 @@ import { BehaviorSubject, Observable, Subject, Subscription, from, of, timer } f
 import { catchError, concatMap, debounceTime, filter, mergeAll, mergeMap, take, throttleTime } from 'rxjs/operators';
 import { ApiLink, CollectionApiObject, PageApiObject } from 'src/app/services/api-data-types';
 import { CurrentExperimentService } from 'src/app/services/current-experiment.service';
-import { QhanaBackendService, TimelineStepApiObject, TimelineSubStepApiObject } from 'src/app/services/qhana-backend.service';
+import { ExperimentResultQuality, QhanaBackendService, TimelineStepApiObject, TimelineSubStepApiObject } from 'src/app/services/qhana-backend.service';
 import { PluginRegistryBaseService } from 'src/app/services/registry.service';
 import { TabDefinition } from '../timeline-step-nav/timeline-step-nav.component';
 
@@ -46,7 +46,7 @@ export class TimelineStepComponent implements OnInit, OnDestroy {
     ];
 
     timelineStep: TimelineStepApiObject | null = null;
-    resultQuality: "UNKNOWN" | "NEUTRAL" | "GOOD" | "BAD" | "ERROR" | "UNUSABLE" = "UNKNOWN";
+    resultQuality: ExperimentResultQuality = "UNKNOWN";
     stepProcessor: Promise<string | null> | null = null;
     stepProgress: Progress | null = null;
     substeps: TimelineSubStepApiObject[] | null = null;
@@ -248,7 +248,7 @@ export class TimelineStepComponent implements OnInit, OnDestroy {
         });
     }
 
-    saveResultQuality(newQuality: "UNKNOWN" | "NEUTRAL" | "GOOD" | "BAD" | "ERROR" | "UNUSABLE") {
+    saveResultQuality(newQuality: ExperimentResultQuality) {
         if (this.stepId == null) {
             return;
         }
diff --git a/src/app/services/qhana-backend.service.ts b/src/app/services/qhana-backend.service.ts
index ddfc0bc..1489f02 100644
--- a/src/app/services/qhana-backend.service.ts
+++ b/src/app/services/qhana-backend.service.ts
@@ -20,6 +20,9 @@ import { Observable, Subject } from 'rxjs';
 import { filter, map, mergeMap, take } from 'rxjs/operators';
 import { ServiceRegistryService } from './service-registry.service';
 
+export const ExperimentResultQualityValues = ["UNKNOWN", "NEUTRAL", "GOOD", "BAD", "ERROR", "UNUSABLE"] as const;
+export type ExperimentResultQuality = typeof ExperimentResultQualityValues[number];
+
 export interface ApiObject {
     "@self": string;
 }
@@ -142,7 +145,7 @@ export interface TimelineStepApiObject extends ApiObject {
     start: string;
     end: string;
     status: string;
-    resultQuality: "UNKNOWN" | "NEUTRAL" | "GOOD" | "BAD" | "ERROR" | "UNUSABLE";
+    resultQuality: ExperimentResultQuality;
     resultLog?: string;
     notes: string;
     processorName: string;
@@ -175,6 +178,7 @@ export interface TimelineStepPageOptions {
     version?: string;
     stepStatus?: "SUCCESS" | "PENDING" | "ERROR" | "";
     unclearedSubstep?: number;
+    resultQuality?: ExperimentResultQuality | "";
 }
 
 export interface TemplateApiObject extends ApiObject {
@@ -446,12 +450,13 @@ export class QhanaBackendService {
         );
     }
 
-    public getTimelineStepsPage(experimentId: number | string, { page = 0, itemCount = 10, sort = 1, pluginName = "", version = "", stepStatus = "", unclearedSubstep = 0 }: TimelineStepPageOptions): Observable<ApiObjectList<TimelineStepApiObject>> {
+    public getTimelineStepsPage(experimentId: number | string, { page = 0, itemCount = 10, sort = 1, pluginName = "", version = "", stepStatus = "", unclearedSubstep = 0, resultQuality = "", }: TimelineStepPageOptions): Observable<ApiObjectList<TimelineStepApiObject>> {
         const queryParams = new HttpParams()
             .append("plugin-name", pluginName)
             .append("version", version)
             .append("status", stepStatus)
             .append("uncleared-substep", unclearedSubstep)
+            .append("result-quality", resultQuality)
             .append("page", page)
             .append("item-count", itemCount)
             .append("sort", sort);
@@ -486,7 +491,7 @@ export class QhanaBackendService {
         );
     }
 
-    public saveTimelineStepResultQuality(experimentId: number | string, step: number | string, newQuality: "UNKNOWN" | "NEUTRAL" | "GOOD" | "BAD" | "ERROR" | "UNUSABLE"): Observable<null> {
+    public saveTimelineStepResultQuality(experimentId: number | string, step: number | string, newQuality: ExperimentResultQuality): Observable<null> {
         return this.callWithRootUrl<null>(
             rootUrl => this.http.put<null>(`${rootUrl}/experiments/${experimentId}/timeline/${step}`, { resultQuality: newQuality })
         );