I use my statistical data to develop my own goals. When we can look back and see what we did, then we can predict. I always know my numbers, so I can predict growth for the next year and figure out how I want to improve.
In my self-contained classroom, I did a compilation of 180 students I taught over a three-and one-half-year period. Of those 180 students who came through my classroom, 66 passed the GED exam. When I subtracted out those who were removed because of discipline issues, went home before they could get their GED, or quit, 75% of my students passed the GED test.