Data Reduction.. sound complex, but you already do it all the time. Make a chart. Write a summary. Calculate an average score for a single student, or for the entire class (reducing all your scores down to 1 score). How do you reduce all the grades and observations you make of each student down to a simple report card sized statement, and then further reduce that down to show others how your class is improving over time?
(These are just your own initial thoughts, not for public discussion)