Siebel Anywhere Administration Guide > Upgrade Planning and Preliminary Tasks > Determining Upgrade Requirements >
Choosing Required or Optional Upgrade Types
It is possible to define an upgrade kit as either required or optional, as described in Upgrade Kits. However, it is recommended that you initially define every upgrade kit as optional. Your test clients can test an optional kit at their convenience, while keeping read/write access to the Siebel application in the meantime.
When you are satisfied that an optional upgrade kit functions appropriately for test clients, you can modify the kit to make it required, retest it as a required kit, and distribute it to production users as a required kit. For more information about this process, see Converting an Optional Kit to a Required Kit.