What does "Performance Excellence" mean?

[arrivederche]

Please, help me to understand the phrase Performance Excellence, here's the context:

This guide has been produced to help you support the members of your team to maximize their achievements under Performance Management process.
Performance Excellence comprises three phases and is a long-term process:

I suppose, it's kind of perfect result of the employee's work...

[Tdol]

Not necessarily perfect, but a very standard.

[arrivederche]

Thanks!