## Science behind the Diagnostic: How It Works and What It Means

The i-Ready Diagnostic is an adaptive assessment that measures key content domains in Mathematics and Reading in Grades K–12. It is designed to provide accurate and actionable data to help educators guide students toward continued growth.

### What the Diagnostic Measures

The i-Ready Diagnostic for Reading and for Mathematics measures the concepts critical to preparing a student for grade-level success.

### How the Diagnostic Works

The computer-adaptive i-Ready Diagnostic assessment has specific test flows, stopping rules, and other characteristics that make it an efficient and rigorous measure of student learning.

##### FAQ: What is the test flow of the i-Ready Diagnostic for Reading?

Test flow is the order in which students receive test items from each domain on the i-Ready Diagnostic. The i-Ready Diagnostic for Reading’s test flow varies by chronological grade level.

##### FAQ: What is the test flow of the i-Ready Diagnostic for Mathematics?

Test flow is the order in which students receive test items from each domain on the i-Ready Diagnostic. The i-Ready Diagnostic for Mathematics’s test flow varies by grade band.

### i-Ready Diagnostic’s Assessment Duration

The amount of time it takes a student to complete the Diagnostic can vary by grade, subject, and other factors.

### Understanding the Difficulty and the Duration of the i-Ready Diagnostic

This document explains the level of difficulty of the i-Ready Diagnostic, the time it takes to complete the assessment, and how these elements help precisely determine what a student knows and can do.

### i-Ready: Aligned with the Science of Reading

i-Ready Assessments and i-Ready Personalized Instruction are aligned with the Science of Reading in a number of ways.

### Get the Facts: Assessing Phonological Awareness beyond Grade 1

Improper interpretation of screening data can lead to the misidentification of students in need of reading intervention. The link below offers information about why Phonological Awareness should not be the preliminary screening measure for students in Grades 2 and up.