---
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


---

# Style rules definition

# Style rules definition {#ariaid-title1}

Release version: Australia  
Updated March 12, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
You can create a style span to specify the color for different events in a change
schedule. Style spans in a schedule help to quickly identify characteristics of a change based on
a field value from the Change Request.

Change Schedules includes several base styles to ensure every schedule has span styles to begin
with. By default, Blackout Schedules are represented by a gray color, Maintenance schedules are
represented by a light blue color and change requests are represented by either red (risk =
High), orange (risk = moderate), or green (risk = low).

To define style rules, you must activate Change Management - Change Schedule plugin
(com.snc.change_management.soc).  
You can define styles in multiple ways, such as from the Default Style Rules, Change Schedule definitions, or from the Span Style window in the Change Schedule timeline.  
Note:  
All style rule tables extend the Style Rule Core table \[chg_soc_style_rule_core\].
* **[Define default style rules](https://servicenow-prod.fluidtopics.net/Hnop5K7prRjpi1RpeZqAkg)**   
  You can define style rules from the Default Style Rules module when you want the style rules to be used by change schedules globally and not for any specific application.
* **[Define style rules from Change Schedule Definitions](https://servicenow-prod.fluidtopics.net/qtZOy5v9iQBpXTR2Ir0ypQ)**   
  You can define style rules from change schedule definitions when you want the style rules to be applied to the change schedule related to the change schedule definition.
* **[Define style rules from Change Schedules View](https://servicenow-prod.fluidtopics.net/wArKZAX5ftTHjaqf5lc44A)**   
  You can create style rules from the change schedules view when you want the style rules to be applied to the specific change schedule where it is defined.

**Related concepts**   

* [Change schedules view](https://servicenow-prod.fluidtopics.net/X2wh0ZtuVyWBU~D6~Ig89g "The Change Schedules module provides a Gantt or timeline view of change requests based on criteria defined within a Change Schedule Definition.")  
**Related tasks**   

* [Create a change schedule from the Change Schedules page](https://servicenow-prod.fluidtopics.net/jPwnvMM1TUh8koSoLRTmCA "You can create a change schedule to view all scheduled changes, change tasks, blackout periods, maintenance windows for any given date, week, month, or year.")
* [Create a change schedule from the change schedule definition](https://servicenow-prod.fluidtopics.net/0zv2amIC4~CG2W9FLc_eyQ "You can define a change schedule from a change schedule definition record. Change schedule definitions help you to define the content that displays in the change summary popover, the users, groups or roles with whom a schedule is to be shared, and related span style colors.")
* [Add related tasks to a change schedule](https://servicenow-prod.fluidtopics.net/qyCYK~ZBVghy6nzHUQTQjg "Create related definitions to present related tasks for change requests in the change schedule. For example, to view the change tasks associated with a change request, you need to define a related definition.")