As a people, we have a weird relationship with data. On the
one hand, we love to collect it; we love to measure every possible entity from
every conceivable angle so that we can arrange all those numbers in tables,
spreadsheets and graphs. On the other hand, we like to take all those numbers
and distill them down to a single digit. It’s as if we overwhelm ourselves with
numbers and respond by getting rid of most of them.
One of my fourth graders was able to put her finger on it. We
were learning how to find averages. One of the practice problems involved five
kids who went fishing. Each kid caught a different number of fish and my
students had to find the average. Like a good teacher, I started with the concrete.
I had each student build towers of interlocking cubes corresponding to the
fish. When they were done, they all had five towers of cubes standing on their
desks. “Finding the average,” I announced, “means finding the number of fish
each kid caught, if they all caught the same amount. That means we’ll have them
‘share’ the fish. We take some fish from the lucky kids and give them to the kids
who weren’t so lucky. We’ll ‘even out’ the towers until they’re all the same
height.” The answer was six. Then I showed them how to find the same number by
adding up all the fish and dividing the total by five. The answer was still
six.
That’s when Kiran spoke up. “I understand how to do this,
but I’m not sure why,” she said, “Why is the average number of fish more
important than knowing how many fish each kid caught?” Good question, Kiran.
It’s the same question I have about Senate Bill 5328, which
is moving its way through the Washington Legislature. It would require the
state to post a letter grade for each school based on how well their students
did on the state test. The bill's supporters think it will make it easier for parents to figure
out how well their local schools are doing, while holding educators more
accountable for their students’ achievement. I think it’s unnecessary,
simplistic and at odds with the last school-reform law out of Olympia: the teacher
evaluation system.