> For the complete documentation index, see [llms.txt](https://developer.emporix.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.emporix.io/value-stream-modeller/learning-trails/trail/adding-conditional-step-in-value-stream.md).

# Adding a Conditional Step in a Value Stream

With the **Hello World** value stream from the first trail in place, you can add conditional logic to control when a process step runs. In this trail, you send an additional email notification only when the sender provides a specific form response.

You first create a new Make scenario, then apply a condition to the process step in the Hello World value stream.

## Creating a new scenario to respond to senders needing outreach

Similar to [Setting up a First Value Stream](/value-stream-modeller/learning-trails/trail/setting-up-a-first-value-stream.md), create a scenario named **Send a Survey Feedback** that sends another email to form recipients.

{% stepper %}
{% step %}

#### Create the Hello World Outreach Sent event

In **VSM**, go to **Events** -> **Event Registry** and create a new `hello_outreach_sent` event named **Hello World Outreach Sent**.

<figure><img src="/files/bgS6HMLEl1uTKCrZKndJ" alt="Hello World Outreach Sent event in Event Registry"><figcaption><p>Hello World Outreach Sent event in Event Registry</p></figcaption></figure>
{% endstep %}

{% step %}

#### Open the Hello World value stream

Go to **Value Streams** and open the **Hello World** process you created in the first trail.
{% endstep %}

{% step %}

#### Create a new scenario process step

Add a new process step and select **Create New Scenario**. Make opens a scenario template.

<figure><img src="/files/IKsNeyN5c2N52n8qXROU" alt="Create New Scenario option in the process step"><figcaption><p>Create New Scenario option in the process step</p></figcaption></figure>
{% endstep %}

{% step %}

#### Configure the Trigger Event connection

In the Make scenario, establish the connection in the **Trigger Event** module.

<figure><img src="/files/OZjbMZi2SC7iYoPp0jca" alt="Trigger Event webhook connection in Make" width="485"><figcaption><p>Trigger Event webhook connection in Make</p></figcaption></figure>
{% endstep %}

{% step %}

#### Add the first Set Variable from Process Context module

Add the **Set Variable from Process Context** module and configure it:

* Assign the data from the **Trigger Event**
* Select the **Hello World** value stream
* Use the latest Instance ID as the **Example Instance** – select the ID from the drop-down list. The ID at the top is from the latest instance
* Select **Hello World Feedback Sent** as the **Event Type**
* Select `email` from the **Field** drop-down list
* Enter `email` in the **Variable Name** field

<figure><img src="/files/h329zoHRarv2fhaf1TQZ" alt="First Set Variable from Process Context module configuration"><figcaption><p>First Set Variable from Process Context module configuration</p></figcaption></figure>
{% endstep %}

{% step %}

#### Add the second Set Variable from Process Context module

Add a second **Set Variable from Process Context** module and configure it:

* Assign the data from the **Trigger Event**
* Select the **Hello World** value stream
* Use the latest Instance ID as the **Example Instance** – select the ID from the drop-down list. The ID at the top is from the latest instance
* Select **Hello World Feedback Provided** as the **Event Type**
* Select `forms.0.payload.firstName` from the **Field** drop-down list
* Enter `firstName` in the **Variable Name** field
* Set **Raise Error when Null** to **Yes**

<figure><img src="/files/L2Moz2nKPl4YbzuJfjDe" alt="Second Set Variable from Process Context module configuration"><figcaption><p>Second Set Variable from Process Context module configuration</p></figcaption></figure>
{% endstep %}

{% step %}

#### Add the Gmail module

Add the **Gmail** (Send an Email) module. This trail uses Gmail as the example mail provider, as in [Setting up a First Value Stream](/value-stream-modeller/learning-trails/trail/setting-up-a-first-value-stream.md). You can use any supported provider.

<figure><img src="/files/FFqsB36LT8JgxYyb4rwR" alt="Gmail module in the Make scenario"><figcaption><p>Gmail module in the Make scenario</p></figcaption></figure>
{% endstep %}

{% step %}

#### Configure the Completion Event

In the **Completion Event** module, select **Hello World Outreach Sent** as the **Event Type**.
{% endstep %}

{% step %}

#### Save and run the scenario once

Save the scenario and select **Run once**. The scenario should look like this:

<figure><img src="/files/yLFA83m2sxdvTw4alPxp" alt="Complete Send a Survey Feedback scenario in Make"><figcaption><p>Complete Send a Survey Feedback scenario in Make</p></figcaption></figure>
{% endstep %}

{% step %}

#### Add the scenario to the value stream

In **VSM**, open the **Hello World** value stream. Add a new process step with the new scenario. **Send a Survey Feedback** is visible in the available scenarios list. Select it as the process step.

<figure><img src="/files/RyMmfpwgzjNkt7n6cxY2" alt="Send a Survey Feedback scenario added as a process step"><figcaption><p>Send a Survey Feedback scenario added as a process step</p></figcaption></figure>
{% endstep %}

{% step %}

#### Publish and activate the value stream

Select **Publish**, then confirm the value stream is active.
{% endstep %}

{% step %}

#### Activate the Make scenarios

Ensure the **Send a Survey on Hello World** and **Send a Survey Feedback** scenarios in Make are active.
{% endstep %}

{% step %}

#### Test the value stream

Re-run the value stream by sending a new trigger event. Use the same Postman request or Celonis Action Flow you used in [Setting up a First Value Stream](/value-stream-modeller/learning-trails/trail/setting-up-a-first-value-stream.md).

After you send the event, you receive an email requesting a form response. After you submit the response, you receive a second email with a thank-you message.

<figure><img src="/files/dkRwANfmItg5OC8lRc33" alt="Thank-you email after form submission"><figcaption><p>Thank-you email after form submission</p></figcaption></figure>
{% endstep %}
{% endstepper %}

## Applying conditional logic with JSON

Up to this point, the **Send a Survey Feedback** scenario runs for any form response. Limit the step so it runs only when the response is `indifferent` or `sad`. Apply a condition on the **Send a Survey Feedback** process step in the **Hello World** value stream.

{% stepper %}
{% step %}

#### Open the step filter configuration

Go to the **Hello World** value stream. On the **Send a Survey Feedback** process step, select **Add step filter**.
{% endstep %}

{% step %}

#### Enter the JSON Logic expression

Open the **Condition** tab. In the **JSON Logic Expression** field, enter the following expression:

```json
{
    "in": [
        {
            "context": "hello_feedback_provided.forms.0.payload.sentiment"
        },
        [
            "indifferent",
            "sad"
        ]
    ]
}
```

<figure><img src="/files/jZZqEgl0eebefHZqMOVt" alt="JSON Logic Expression in the Condition tab"><figcaption><p>JSON Logic Expression in the Condition tab</p></figcaption></figure>

The condition maps variables to the relevant fields in your process context.
{% endstep %}

{% step %}

#### Save the condition

Save the expression as the process step condition and then save the value stream.
{% endstep %}

{% step %}

#### Publish and activate the value stream

Publish the new version of the value stream and ensure it is active. Only responses with **indifferent** or **sad** values run the **Send a Survey Feedback** step.

The value stream completes regardless of the form response.
{% endstep %}

{% step %}

#### Test with different form responses

Send the event request again using Postman or Celonis Action Flow. You receive a form submission request again.

* Submit **happy** as the response – the **Send a Survey Feedback** process step does not run.
* Submit **indifferent** or **sad** – the **Send a Survey Feedback** step runs and you receive another email with the thank-you message and next-step information.
  {% endstep %}

{% step %}

#### Verify the results in the debugger

Open debug mode to verify the value stream behavior. Go to the **Hello World** value stream and choose the debugger action.

<figure><img src="/files/Q18heUcMRoxoe2xHFM4P" alt="Hello World value stream in debug mode"><figcaption><p>Hello World value stream in debug mode</p></figcaption></figure>

* **Happy** response – the step was filtered

<figure><img src="/files/aVPmBrdUwVPGYaJLCWFp" alt="Filtered step for a happy response"><figcaption><p>Filtered step for a happy response</p></figcaption></figure>

* **Indifferent** or **sad** response – the step was invoked

<figure><img src="/files/8gHpYp4Kx41ETtfWnoP4" alt="Invoked step for an indifferent or sad response"><figcaption><p>Invoked step for an indifferent or sad response</p></figcaption></figure>
{% endstep %}
{% endstepper %}

You can also use events as conditions on process steps. Multiple events can be assigned to a step or group of steps, and both `IN (OR)` and `AND` operators are supported. This is the preferred option when you only need to test for the presence of an event.

<figure><img src="/files/AzG1FZITH63Ee3GNCXnw" alt="Event-based step filter configuration" width="552"><figcaption><p>Event-based step filter configuration</p></figcaption></figure>

{% hint style="info" %}

* To learn more about conditional logic in VSM, see [Conditions](/value-stream-modeller/value-stream-designer/process-components/conditions.md).
* To learn more about JsonLogic, see [Supported Operations](https://jsonlogic.com/operations.html) and [Play with JsonLogic](https://jsonlogic.com/play.html).
  {% endhint %}


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