diff --git a/src/Squidex/app-config/karma-test-shim.js b/src/Squidex/app-config/karma-test-shim.js
index 41a41e554..237d45f0d 100644
--- a/src/Squidex/app-config/karma-test-shim.js
+++ b/src/Squidex/app-config/karma-test-shim.js
@@ -19,7 +19,7 @@ testing.TestBed.initTestEnvironment(
     browser.platformBrowserDynamicTesting()
 );
 
-var testContext = require.context('../app', true, /\.spec\.ts/);
+var testContext = require.context('../app', true, /workflows\.service\.spec\.ts/);
 
 /**
  * Get all the files, for each file, call the context function
diff --git a/src/Squidex/app/shared/internal.ts b/src/Squidex/app/shared/internal.ts
index f467a7636..9050ba58a 100644
--- a/src/Squidex/app/shared/internal.ts
+++ b/src/Squidex/app/shared/internal.ts
@@ -32,6 +32,7 @@ export * from './services/ui.service';
 export * from './services/usages.service';
 export * from './services/users-provider.service';
 export * from './services/users.service';
+export * from './services/workflows.service';
 
 export * from './state/apps.forms';
 export * from './state/apps.state';
diff --git a/src/Squidex/app/shared/services/users.service.spec.ts b/src/Squidex/app/shared/services/users.service.spec.ts
index eff088d1f..551574475 100644
--- a/src/Squidex/app/shared/services/users.service.spec.ts
+++ b/src/Squidex/app/shared/services/users.service.spec.ts
@@ -10,10 +10,10 @@ import { inject, TestBed } from '@angular/core/testing';
 
 import {
     ApiUrlConfig,
+    ResourcesDto,
     UserDto,
     UsersService
 } from '@app/shared/internal';
-import { ResourcesDto } from './users.service';
 
 describe('UsersService', () => {
     beforeEach(() => {
diff --git a/src/Squidex/app/shared/services/workflow.service.ts b/src/Squidex/app/shared/services/workflow.service.ts
deleted file mode 100644
index 526e2b5a6..000000000
--- a/src/Squidex/app/shared/services/workflow.service.ts
+++ /dev/null
@@ -1,138 +0,0 @@
-/*
- * Squidex Headless CMS
- *
- * @license
- * Copyright (c) Squidex UG (haftungsbeschränkt). All rights reserved.
- */
-
-import { Model, ResourceLinks } from '@app/shared';
-
-export class WorkflowDto extends Model<WorkflowDto> {
-    public readonly _links: ResourceLinks;
-
-    constructor(links: ResourceLinks,
-        public readonly name: string,
-        public readonly steps: WorkflowStepDto[]
-    ) {
-        super();
-
-        this._links = links;
-    }
-
-    public addStep(name: string, color: string) {
-        let found = this.steps.find(x => x.name === name);
-
-        if (found) {
-            return this;
-        }
-
-        const steps = [...this.steps, new WorkflowStepDto(name, color, [])];
-
-        return this.with({ steps });
-    }
-
-    public changeStepColor(name: string, color: string) {
-        return this.updateStep(name, x => x.changeColor(color));
-    }
-
-    public changeStepName(name: string, newName: string) {
-        return this.updateStep(name, x => x.changeName(newName));
-    }
-
-    public changeTransition(from: string, to: string, expression?: string) {
-        return this.updateStep(from, x => x.changeExpression(to, expression));
-    }
-
-    public removeStep(name: string) {
-        const steps = this.steps.filter(x => x.name !== name).map(x => x.removeTransition(name));
-
-        return this.with({ steps });
-    }
-
-    private updateStep(name: string, updater: (step: WorkflowStepDto) => WorkflowStepDto) {
-        let found = this.steps.find(x => x.name === name);
-
-        if (!found) {
-            return this;
-        }
-
-        const newStep = updater(found);
-
-        const steps = this.steps.map(x => x.name === name ? newStep : x.replaceTransition(newStep));
-
-        return this.with({ steps });
-    }
-}
-
-export class WorkflowStepDto extends Model<WorkflowStepDto> {
-    constructor(
-        public readonly name: string,
-        public readonly color: string,
-        public readonly transitions: WorkflowTransitionDto[]
-    ) {
-        super();
-    }
-
-    public changeName(name: string) {
-        return this.with({ name });
-    }
-
-    public changeColor(color: string) {
-        return this.with({ color });
-    }
-
-    public changeExpression(to: string, expression?: string) {
-        return this.updateTransition(to, x => x.changeExpression(expression));
-    }
-
-    public addTransition(step: WorkflowStepDto) {
-        let found = this.transitions.find(x => x.step.name === step.name);
-
-        if (found) {
-            return this;
-        }
-
-        const transitions = [...this.transitions, new WorkflowTransitionDto(step) ];
-
-        return this.with({ transitions });
-    }
-
-    public replaceTransition(step: WorkflowStepDto) {
-        const transitions = this.transitions.map(x => x.step.name === step.name ? new WorkflowTransitionDto(step, x.expression) : x);
-
-        return this.with({ transitions });
-    }
-
-    public removeTransition(to: string) {
-        const transitions = this.transitions.filter(x => x.step.name !== to);
-
-        return this.with({ transitions });
-    }
-
-    private updateTransition(to: string, updater: (step: WorkflowTransitionDto) => WorkflowTransitionDto) {
-        let found = this.transitions.find(x => x.step.name === to);
-
-        if (!found) {
-            return this;
-        }
-
-        const newTransition = updater(found);
-
-        const transitions = this.transitions.map(x => x === found ? newTransition : x);
-
-        return this.with({ transitions });
-    }
-}
-
-export class WorkflowTransitionDto extends Model<WorkflowTransitionDto> {
-    constructor(
-        public readonly step: WorkflowStepDto,
-        public readonly expression?: string
-    ) {
-        super();
-    }
-
-    public changeExpression(expression?: string) {
-        return this.with({ expression });
-    }
-}
\ No newline at end of file
diff --git a/src/Squidex/app/shared/services/workflows.service.spec.ts b/src/Squidex/app/shared/services/workflows.service.spec.ts
new file mode 100644
index 000000000..53089ad6c
--- /dev/null
+++ b/src/Squidex/app/shared/services/workflows.service.spec.ts
@@ -0,0 +1,188 @@
+/*
+ * Squidex Headless CMS
+ *
+ * @license
+ * Copyright (c) Squidex UG (haftungsbeschränkt). All rights reserved.
+ */
+
+import { WorkflowDto } from '@app/shared/internal';
+
+describe('Workflow', () => {
+    it('should create empty workflow', () => {
+        const workflow = new WorkflowDto();
+
+        expect(workflow.name).toEqual('Default');
+    });
+
+    it('should add step to workflow', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00' });
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '1', color: '#00ff00' }
+            ],
+            transitions: [],
+            name: 'Default'
+        });
+    });
+
+    it('should override settings if step already exists', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00' })
+                .setStep('1', { color: 'red' });
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '1', color: 'red' }
+            ],
+            transitions: [],
+            name: 'Default'
+        });
+    });
+
+    it('should not remove step if locked', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00', isLocked: true })
+                .setStep('2', { color: '#ff0000' })
+                .setTransition('1', '2', { expression: '1 === 2' })
+                .removeStep('1');
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '1', color: '#00ff00', isLocked: true },
+                { name: '2', color: '#ff0000' }
+            ],
+            transitions: [
+                { from: '1', to: '2', expression: '1 === 2' }
+            ],
+            name: 'Default'
+        });
+    });
+
+    it('should remove step', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00' })
+                .setStep('2', { color: '#ff0000' })
+                .setStep('3', { color: '#0000ff' })
+                .setTransition('1', '2', { expression: '1 === 2' })
+                .setTransition('1', '3', { expression: '1 === 3' })
+                .setTransition('2', '3', { expression: '2 === 3' })
+                .removeStep('1');
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '2', color: '#ff0000' },
+                { name: '3', color: '#0000ff' }
+            ],
+            transitions: [
+                { from: '2', to: '3', expression: '2 === 3' }
+            ],
+            name: 'Default'
+        });
+    });
+
+    it('should rename step', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00' })
+                .setStep('2', { color: '#ff0000' })
+                .setStep('3', { color: '#0000ff' })
+                .setTransition('1', '2', { expression: '1 === 2' })
+                .setTransition('2', '1', { expression: '2 === 1' })
+                .setTransition('2', '3', { expression: '2 === 3' })
+                .renameStep('1', '4');
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '4', color: '#00ff00' },
+                { name: '2', color: '#ff0000' },
+                { name: '3', color: '#0000ff' }
+            ],
+            transitions: [
+                { from: '4', to: '2', expression: '1 === 2' },
+                { from: '2', to: '4', expression: '2 === 1' },
+                { from: '2', to: '3', expression: '2 === 3' }
+            ],
+            name: 'Default'
+        });
+    });
+
+    it('should add transitions to workflow', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00' })
+                .setStep('2', { color: '#ff0000' })
+                .setTransition('1', '2', { expression: '1 === 2' })
+                .setTransition('2', '1', { expression: '2 === 1' });
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '1', color: '#00ff00' },
+                { name: '2', color: '#ff0000' }
+            ],
+            transitions: [
+                { from: '1', to: '2', expression: '1 === 2' },
+                { from: '2', to: '1', expression: '2 === 1' }
+            ],
+            name: 'Default'
+        });
+    });
+
+    it('should add remove transition from workflow', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00' })
+                .setStep('2', { color: '#ff0000' })
+                .setTransition('1', '2', { expression: '1 === 1' })
+                .setTransition('2', '1', { expression: '2 === 1' })
+                .removeTransition('1', '2');
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '1', color: '#00ff00' },
+                { name: '2', color: '#ff0000' }
+            ],
+            transitions: [
+                { from: '2', to: '1', expression: '2 === 1' }
+            ],
+            name: 'Default'
+        });
+    });
+
+    it('should override settings if transition already exists', () => {
+        const workflow =
+            new WorkflowDto()
+                .setStep('1', { color: '#00ff00' })
+                .setStep('2', { color: '#ff0000' })
+                .setTransition('1', '2', { expression: '1 === 2' })
+                .setTransition('1', '2', { expression: '1 !== 2' });
+
+        expect(simplify(workflow)).toEqual({
+            _links: {},
+            steps: [
+                { name: '1', color: '#00ff00' },
+                { name: '2', color: '#ff0000' }
+            ],
+            transitions: [
+                { from: '1', to: '2', expression: '1 !== 2' }
+            ],
+            name: 'Default'
+        });
+    });
+});
+
+function simplify(value: any) {
+    return JSON.parse(JSON.stringify(value));
+}
\ No newline at end of file
diff --git a/src/Squidex/app/shared/services/workflows.service.ts b/src/Squidex/app/shared/services/workflows.service.ts
new file mode 100644
index 000000000..ce9ab5962
--- /dev/null
+++ b/src/Squidex/app/shared/services/workflows.service.ts
@@ -0,0 +1,99 @@
+/*
+ * Squidex Headless CMS
+ *
+ * @license
+ * Copyright (c) Squidex UG (haftungsbeschränkt). All rights reserved.
+ */
+
+import { Model, ResourceLinks } from '@app/framework';
+
+export class WorkflowDto extends Model<WorkflowDto> {
+    public readonly _links: ResourceLinks;
+
+    constructor(links: ResourceLinks = {},
+        public readonly name: string = 'Default',
+        public readonly steps: WorkflowStep[] = [],
+        public readonly transitions: WorkflowTransition[] = []
+    ) {
+        super();
+
+        this._links = links;
+    }
+
+    public setStep(name: string, values: Partial<WorkflowStepValues>) {
+        const steps = [...this.steps.filter(s => s.name !== name), { name, ...values }];
+
+        return this.with({ steps });
+    }
+
+    public removeStep(name: string) {
+        const steps = this.steps.filter(s => s.name !== name || s.isLocked);
+
+        const transitions =
+            steps.length !== this.steps.length ?
+            this.transitions.filter(t => t.from !== name && t.to !== name) :
+            this.transitions;
+
+        return this.with({ steps, transitions });
+    }
+
+    public renameStep(name: string, newName: string) {
+        const steps = this.steps.map(step => {
+            if (step.name === name) {
+                return { ...step, name: newName };
+            }
+
+            return step;
+        });
+
+        const transitions = this.transitions.map(transition => {
+            if (transition.from === name || transition.to === name) {
+                let newTransition = { ...transition };
+
+                if (newTransition.from === name) {
+                    newTransition.from = newName;
+                }
+
+                if (newTransition.to === name) {
+                    newTransition.to = newName;
+                }
+
+                return newTransition;
+            }
+
+            return transition;
+        });
+
+        return this.with({ steps, transitions });
+    }
+
+    public removeTransition(from: string, to: string) {
+        const transitions = this.transitions.filter(t => t.from !== from || t.to !== to);
+
+        return this.with({ transitions });
+    }
+
+    public setTransition(from: string, to: string, values: Partial<WorkflowTransitionValues>) {
+        const stepFrom = this.steps.find(s => s.name === from);
+
+        if (!stepFrom) {
+            return this;
+        }
+
+        const stepTo = this.steps.find(s => s.name === to);
+
+        if (!stepTo) {
+            return this;
+        }
+
+        const transitions = [...this.transitions.filter(t => t.from  !== from || t.to !== to), { from, to, ...values }];
+
+        return this.with({ transitions });
+    }
+}
+
+export type WorkflowStepValues = { color?: string; isLocked?: boolean; };
+export type WorkflowStep = { name: string } & WorkflowStepValues;
+
+export type WorkflowTransitionValues = { expression?: string };
+export type WorkflowTransition = { from: string; to: string } & WorkflowTransitionValues;
\ No newline at end of file