The Measurement Gap

Thu, 29 Jan 2026 09:00:00 -0600

This is Part 5 of “The Measurement Gap,” a series examining NWEA’s MAP testing and RIT scores—how they work, why teachers don’t trust them, and how they shape acceleration decisions in Oak Park District 97.

Let’s recap what we’ve learned:

Part 1: MAP testing has a troubled history—teacher boycotts, ethics violations, a federal study showing no impact on student achievement, and a recent for-profit conversion.

Part 2: Despite this, the RIT scale rests on genuinely innovative psychometric design—the Rasch model’s elegant mathematics, an equal-interval scale that enables meaningful growth measurement, and an adaptive algorithm that meets each student where they are.

Policy on Acceleration Denied

The Measurement Gap