Assessment on Acceleration Denied

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.

The Beautiful Math

Thu, 08 Jan 2026 09:00:00 -0600

This is Part 2 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.

In Part 1, I documented MAP testing’s troubled history: teacher boycotts, ethics violations, a federal study showing no impact, and a for-profit conversion that raises new questions.

But controversy doesn’t mean the underlying design is bad. Before we can fairly evaluate MAP’s role in acceleration decisions, we need to understand what it’s actually trying to do—and the genuinely innovative mathematics that make it work.

The Test That Ate America

Thu, 01 Jan 2026 09:00:00 -0600

This is Part 1 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.

In January 2013, nearly every teacher at Seattle’s Garfield High School did something unprecedented: they unanimously voted to refuse to give a test.

Not the SAT. Not a state graduation exam. A test most parents had never heard of—the Measures of Academic Progress, or MAP, published by the Northwest Evaluation Association (NWEA).