classic grades-and-steps position management system (old system) that traditionally emphasized seniority

Question #4. In an essay

a) Describe the classic grades-and-steps position management system (old system) that traditionally emphasized seniority. Examples (Public Sectors)?

(b) Describe the more recently grade & range position management system (new system) that is supposed to emphasize performance based on merit. Examples(Public Sectors)?

(c) Discuss the strengths and weaknesses of each type of system.

2 pages single space