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

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    - brazil

ft:locale :

    - en-US

ft:publication_title :

    - Brazil IT Service Management

ft:clusterId :

    - itsm

bundleId :

    - itsm

workflow :

    - Technology


---

# Success Probability definitions

# Success Probability definitions {#ariaid-title1}

Release version: Brazil  
Updated September 10, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
Success Probability definition is a configuration that defines the probability and the matching conditions of a change request.

By default, the success probability definition is defined for Change Success Score, Change
Model Success, and Calculated.

The Order field determines the execution order of the definitions. The definition with the lowest order value has the highest precedence.

The default values are created for Change Model Success, Change Success Score, and Calculated regardless of the probability selected on the success probability definition.

Change managers can modify the existing records in the table. The Success Score Validations business rule validates if any record is created with the allowed minimum and maximum values for Change Model Success and Change Success
Score.

When Change Model Success or Change Success Score is set as probability on the Success probability definition, the corresponding related list is visible on the Success probability definition record. When Calculated is set, all
three related lists are visible on the record.

The Greater than or equal to field of Change Model Success and Change Success Score related list determines the Success Probability that must be returned by the Success probability definition.

For example, if the Probability is set to Calculated on the record, and if Change Model Success evaluates to High and Change Success Score evaluates to Moderate, the success Probability definition returns High as the Success
Probability.

You can edit the value in the Calculated success probability column for each combination of Change model success and Change success score. When you modify the choices for success probability on a change request, you must select
Refresh probability mappings under Related Links to update the combinations of related records for Change Model Success, Change Success Score, and Calculated probabilities. You can
also update the multiple records by executing Refresh probability mappings on the list.  
Note:  
Success probability plugin supports domain separation. The
sn_chg_probability_success,
sn_chg_probability_model_success, and
sn_chg_probability_calculated_lookup tables are process separated when
you install the domain separation plugin.