This chapter provides an overview of the upgrade process of the three Siebel database environments. It includes the following topics:

• Supported Upgrade Paths for Siebel CRM Version 15.5 or Later
• Terms Used in This Guide
• Naming Conventions Used in This Guide
• About File Paths and Commands in Siebel Database Upgrade Topics
• About Supported Siebel Upgrade Paths
• About Siebel Upgrade Environments

NOTE:  For a detailed overview of the upgrade process and related tasks, see Overview of Performing a Siebel Database Upgrade.

NOTE:  The procedures in this guide assume that you do not use left-hand navigation. However, you can set up left-hand navigation. For more information about left-hand navigation and about implementing it, see Siebel Fundamentals for Siebel Open UI.