Keeping score
Keeping score allows you to gauge your progress in achieving your goals. By keeping track of flight performance, the controller can confirm that the airline is meeting its goal of completing all flights on time.
Do you jog, play basketball, ride a bike, or participate in some other team or individual sport? If so, you likely keep track of your performance—even if it's as simple as "I ran that eight-mile loop faster than ever!" or "I scored four more points during this game than I did in the last one."
Why do you keep score in these ways? Like many people, you're probably performance-driven or achievement-oriented—or maybe just naturally competitive. You want to know whether your performance is improving or declining and how your latest achievement compares with your personal best. You crave feedback on how you're doing.
In much the same way, organizations want—and need—to track the changes in their overall performance. And the divisions, units, teams, and individuals within them engage in similar scorekeeping.