---
sourceDocument: Australia IT Service Management
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/it-service-management

 Release :

    - australia

ft:locale :

    - en-US

ft:publication_title :

    - Australia IT Service Management

ft:clusterId :

    - itsm

bundleId :

    - itsm

workflow :

    - Technology


---

# Attach a process for Change model states

# Attach a process for Change model states {#ariaid-title1}

Release version: Australia  
Updated March 12, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
You can attach a process with defined conditions to the Change model states to enable
state transitions.  
This process can be done by using one of the following methods:

* ServiceNow® Workflow Studio: See [Flow Designer](https://www.servicenow.com/docs/access?context=flow-designer&version=australia&pubname=australia-application-development&ft:locale=en-US)
* Business Rules: See [Business rules](https://www.servicenow.com/docs/access?context=c_BusinessRules&version=australia&pubname=australia-api-reference&ft:locale=en-US)
{#attach-process-change-model__ul_hy1_lcl_b4b}

Change flows for default Change models are available in Workflow Studio. For more information on default Change flows, see [Change flows](https://servicenow-prod.fluidtopics.net/Em~Myoh2dbqEBpWXX~rajQ "The Change Management Change flows provide a library of reusable actions and end-to-end implementations of the Change models provided in the base system.").

## Evaluating a Change model {#attach-process-change-model__section_gjv_4ym_b4b}

When your flow is completed, you can evaluate the Change model to process any automated transitions. In Workflow Studio, the Evaluate Change Model action is used to evaluate the Change model.

When using Business Rules, you can use the script to evaluate the Change model. For example, see the Change Registration: Auto State Change business rule on the change_request table.  
You can also evaluate a Change model for a specific Change request using this event:{#attach-process-change-model__table_rj2_x4n_b4b__entry__3}

| Event name | Parameter | Description |
|-|-|-|
| change_model.evaluate | Change Request sys_id | Process that may affect the state of the Change request but doesn't change the Change request record. |
[Table 1. Event to evaluate Change model]

{#attach-process-change-model__table_rj2_x4n_b4b}