Phase 2 would have to be named as 9.0 as it contains major enhancements to the system, keeping in inline with the standards chosen to be used by you.
Versioning question for a major upgrade project
Project to be performed in 2 equally complex phases, each phase to deliver to production about 4 months apart. The project has been identified as 8.0. Our baseline naming convention says change the first number for a major enhancement/upgrade. If the first baseline is named to coincide with the project (8.0), then what name/identifier do I give to the baseline when phase 2 is ready?