Steps for PeopleSoft HCM 9.2 upgrade from Peopletools 8.52 to 8.55 and application HR 9.1 to 9.2. Also oracle database from 11g to 12c.
--> The Upgrade steps here is straight forward.
1) Do a Database upgrade first from 11g to 12c
2) Perform a PeopleTools only upgrade from 8.52 to 8.55.xx
3) Perform Application upgrade from HCM 9.1 to HCM 9.2PI16 direct using the delivered Upgrade change package with 8.55 peopletools
For performing this Initial Upgrade you need 3 Environments
1) Upgrade Source HCM 9.2PI16 with PT 8.55.xx
2) PeopleSoft Update Image whatever Latest. PUM21 or Latest during the Start of Initial pass.
3) Upgrade Target, A Latest Copy of Production DB upgraded to 12c with 9.1/8.5