{"revision":"c10276e953456835cdbb1f3a60d58ae1980be353","document":{"id":31707,"path":"it-service-management/change-management/attach-process-change-model.md","title":"Attach a process for Change model states","bundle":null,"doc_type":null,"release":"australia","body":"\n# Attach a process for Change model states\n\nYou can attach a process with defined conditions to the Change model states to enable state transitions.\n\nThis process can be done by using one of the following methods:\n\n-   ServiceNow® Workflow Studio: See [Flow Designer](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/application-development/flow-designer.md)\n-   Business Rules: See [Business rules](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/api-reference/c_BusinessRules.md)\n\nChange flows for default Change models are available in Workflow Studio. For more information on default Change flows, see [Change flows](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/it-service-management/change-management/change-flows.md).\n\n## Evaluating a Change model\n\nWhen 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.\n\nWhen 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.\n\nYou can also evaluate a Change model for a specific Change request using this event:\n\n|Event name|Parameter|Description|\n|----------|---------|-----------|\n|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.|\n\n**Parent Topic:**[Create a Change model](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/it-service-management/change-management/create-a-change-model.md)\n\n"}}