Identify 3 key elements of an effective performance management system.

To complete this Assignment respond to the following bullets in a 2- to 3-page paper:
1) Define different types of performance management systems and discuss how they differ.
2) Identify 3 key elements of an effective performance management system.
3) Explain how the 3 elements you identified interact with one another.
4) Then, discuss how their interaction supports the effectiveness of a performance management system.