Why tiered aging is the methodology question.
Aging Egypt salary data with a single rate compresses the variance the board actually needs to see. Junior and entry-level grades move on a different curve to mid-level technical talent, which moves on a different curve again to senior commercial leadership. A tiered aging discipline carries that variance forward instead of averaging it away.
This is a methodology choice, not a market opinion. Evalio treats the aging tier set as part of the engagement design, defined up front and held constant through delivery.