Measurement Moments – Part 7

The terms “reliable” and “valid” are uttered every day in the assessment industry, whether it’s in a political interview or a blog that deals with testing in schools. Unfortunately, reliability and validity have both common and technical meanings, which cause...

Measurement Moments – Part 6

As described in Part 5 of this blog series, a test is designed for a specific purpose, such as granting certification or placing students in entry-level college courses. Specifically, K–12 educational testing aims to find something out about students, such as their...

Measurement Moments – Part 5

A test typically has a single specified purpose. In fact, if a test serves more than one purpose, the secondary or tertiary purposes are rarely well served. For example, the single purpose of an English language learner (ELL) assessment is to determine a student’s...