---
title: Update sets reference
description: Reference topics such as general guidelines and system properties for system update sets.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/australia/application-development/system-update-sets/update-sets-reference.html
release: australia
product: System Update Sets
classification: system-update-sets
topic_type: reference
last_updated: "2026-03-12"
reading_time_minutes: 1
breadcrumb: [System update sets, Deploying applications, Building applications]
---

# Update sets reference

Reference topics such as general guidelines and system properties for system update sets.

-   **[Default update set](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/application-development/system-update-sets/default-update-sets.md)**  
Only one update set can be the default set for any application scope.
-   **[Customizations tracked by update sets](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/application-development/system-update-sets/customizations-tracked-update-sets.md)**  
Update sets track customizations to application tables, fields, and records.
-   **[General guidelines for planning the update process](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/application-development/system-update-sets/get-started-update-sets.md)**  
A reference topic that contains general guidelines to create a standard process for moving customizations from instance to instance.
-   **[Update sets properties](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/application-development/system-update-sets/update-sets-properties.md)**  
A reference topic that contains information on the system properties used with update sets.
-   **[Important considerations before deleting update sets](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/application-development/system-update-sets/delete-update-set-cautions.md)**  
Revert a customization, back out the update set rather than deleting it.

**Parent Topic:**[System update sets](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/australia/application-development/system-update-sets/system-update-sets.md)