Because little pencil pusher Bobby Brown was sitting in his cubical one day and thinking of ways in which he could get his bosses attention giving him an advantage over his co-workers for that sweet sweet promotion. One day he thought to himself hey....when I play Call of Duty we have statistics that track average damage per second. (DPS)....maybe I can take this completely unrelated statistics and make it SPC....so he began his work. He then developed Stops Per Mile and so on. Pretty soon Bobby Brown had a pretty good project portfolio for his
boss. Turns out his boss liked the work. He in turn pitched it to his boss who pitched it to his boss and then pitched it to investors saying UPS can now more accurately evaluate it's business model and identify areas for growth. Turns out little Bobby Brown got that promotion and a free UPS polo shirt. You rock Bobby Brown....you rock.