predefined appraisal process and flexible appraisal process

Hello

I read the new presentation about the New in Performance Management (SAP enhancement package 4

For SAP ERP 6.0) I don't understand the connection between predefined appraisal process and flexible appraisal process.

Can I use these 2 processes together?

Is the new "Predefined Performance Management Process: Calibration" work with flexible appraisal process or this is 2 different system and process?

For example This process of predefined appraisal compare "final appraisal" of workers. Where this "final appraisal" is stored . In which question of the appraisal form ?

In the presentation Sap wrote "Team calibration based on overall appraisal". What is "overall appraisal" in terms of appraisal form ?