"When a measure becomes a target, it ceases to be a good measure" -Charles Goodhart I've read most of PG's letters but I think this is now my favorite because

"When a measure becomes a target, it ceases to be a good measure" -Charles Goodhart I've read most of PG's letters but I think this is now my favorite because while I've noticed each of these issues separately I've never connected them together through this common flaw in our education system. I find it really profound.