Open a gradebook. What do you see?
Typically there are columns for recorded scores from a variety of assignments. The left-most column lists the names of students. Row 1 is a header that labels the type of assignment, followed in the column with the scores that recorded the work by students.
What if, instead, the gradebook looked more like this:
Labels are one key to unlock understanding of achievement data. In this second example, the data has significant meaning. Isn't more important to know what the assignment focused on, then the type of assigned work? There is more to the data in these examples, but to just look narrowly at the impact of substantive labels can raise our understanding of a student's progress.