---
sourceDocument: Brazil IT Service Management
sourceDocumentLink: https://www.servicenow.com/docs/r/it-service-management

 Release :

    - brazil

ft:locale :

    - en-US

ft:publication_title :

    - Brazil 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: Brazil  
Updated September 10, 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.

A change model defines the states of a change request and the conditions that allow a change request to move between states. The conditions alone don't move a change request. A process, either a flow or a
business rule, must evaluate the change model so that any automatic transition whose conditions are met is applied.  
Attach a process by using one of the following methods:

* Workflow Studio flow: Use a flow for a low-code process that runs the Evaluate Change Model action at defined points. See [Flow Designer](https://www.servicenow.com/docs/access?context=flow-designer&version=brazil&pubname=brazil-application-development&ft:locale=en-US).
* Business rule: Use a business rule when the evaluation must run every time the change request record is updated. See [Business rules](https://www.servicenow.com/docs/access?context=c_BusinessRules&version=brazil&pubname=brazil-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://www.servicenow.com/docs/wtARb5OD9eFv~Gx7V7mfZg "Change Management change flows provide a library of reusable actions and end-to-end implementations of the change models in the base system.").

## Automatic transition evaluation {#attach-process-change-model__section_how_transitions_evaluated}

1. You define transition conditions for each model state. For more information, see [Create predefined transition condition types](https://www.servicenow.com/docs/SyBY6IL_0Np4A5pkKDfyBg "Create predefined transition conditions to reuse the conditions for your change models.").
2. You attach a flow or business rule that evaluates the change model.
3. The process runs, for example when the change request is updated or a task is closed.
4. The system checks the automatic transitions for the current state and moves the change request to the first state whose conditions are met.

{#attach-process-change-model__ol_transition_eval}

For example, the Change Registration: Auto State Change business rule on the Change Request \[change_request\] table evaluates the change model after each update. The change request moves to the next state as
soon as its transition conditions are met.

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

After your flow completes, you can evaluate the change model to process any automatic transitions. In Workflow Studio, use the Evaluate Change Model action to evaluate the change model.

When using business rules, you can use a script to evaluate the change model. For example, see the Change Registration: Auto State Change business rule on the Change Request \[change_request\] table.  
You can also evaluate a change model for a specific change request by using the event in the following table.{#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 a change model]

{#attach-process-change-model__table_rj2_x4n_b4b}
**Related tasks**   

* [Create a Change model](https://www.servicenow.com/docs/RyZRO94vLgOdLQtCmb2dXQ "Create change models to configure the states and transitions to match your organization's change processes.")
* [Configure state model transitions](https://www.servicenow.com/docs/nHgqrOTyeAikvLcbq~WLkg "Use script includes or UI policies to configure state models and the criteria for moving change requests from one state to another.")