Style rules definition

concept brazil Updated Sep 10, 2026 2 min read style-rules-definition.md

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
Define style rules from the Default Style Rules module to apply them to all change schedules rather than to a specific application.
Define style rules from Change Schedule Definitions
Define style rules from a change schedule definition to apply them to the change schedule that's related to the definition.
Define style rules from the change schedules view
Create style rules from the change schedules view to apply them to the specific change schedule where they're defined.

Parent Topic:Change schedules

Related topics

Change schedules view

Create a change schedule from the Change Schedules page

Create a change schedule from the change schedule definition

Add related tasks to a change schedule

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---
title: Style rules definition
description: 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.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/it-service-management/change-management/style-rules-definition.html
release: brazil
product: Change Management
classification: change-management
topic_type: concept
last_updated: "2026-09-10"
reading_time_minutes: 2
breadcrumb: [Change schedules, Configure, Change Management, IT Service Management]
---

# Style rules definition

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://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/it-service-management/change-management/def-stl-rules-from-stl-rules-table.md)**  
Define style rules from the Default Style Rules module to apply them to all change schedules rather than to a specific application.
-   **[Define style rules from Change Schedule Definitions](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/it-service-management/change-management/def-stl-rules-from-chng-sch-def.md)**  
Define style rules from a change schedule definition to apply them to the change schedule that's related to the definition.
-   **[Define style rules from the change schedules view](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/it-service-management/change-management/define-style-rules-from-view.md)**  
Create style rules from the change schedules view to apply them to the specific change schedule where they're defined.

**Parent Topic:**[Change schedules](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/it-service-management/change-management/change-schedule.md)

**Related topics**  


[Change schedules view]()

[Create a change schedule from the Change Schedules page]()

[Create a change schedule from the change schedule definition]()

[Add related tasks to a change schedule]()