Data & Ongoing Monitoring

A National Overview of Grantee CLASS® Scores in 2017

During the 2016–2017 program year, the Office of Head Start (OHS) used the Classroom Assessment Scoring System (CLASS®) Pre-K Teacher-Child Observation Instrument during its on-site reviews of grantees. CLASS-reliable reviewers visited a random sample of preschool classrooms to obtain grantee-level scores. This document provides descriptive statistics of the 2017 grantee-level CLASS data.

For more information, see: Use of CLASS in Head Start, available on the ECLKC. Select this link for the PDF version of the report: A National Overview of Grantee CLASS Scores in 2017. Individual grantee CLASS reports also are available on the ECLKC in the Program Service Reports.

National Statistics by Dimension

In 2017, 252 Head Start grantees received CLASS reviews. The CLASS tool has 10 dimensions of teacher-child interactions rated on a 7-point scale, from low to high. The 10 CLASS dimensions are organized into three domains: Emotional Support, Classroom Organization, and Instructional Support.

  • Emotional Support assesses the degree to which teachers establish and promote a positive climate in their classroom through their everyday interactions.
  • Classroom Organization assesses classroom routines and procedures related to the organization and management of children's behavior, time, and attention in the classroom.
  • Instructional Support assesses the ways in which teachers implement the curriculum to effectively promote cognitive and language development.
OHS CLASS® Descriptive Statistics, 2017
National Grantee-Level Scores by Dimension
DomainDimensionMeanStandard DeviationMinimumMaximum
Emotional SupportPositive Climate6.010.384.837.00
Negative Climate1.
Teacher Sensitivity5.880.444.007.00
Regard for Student Perspectives5.450.494.006.86
Classroom OrganizationBehavior
Instructional Learning Formats5.350.484.006.50
Instructional SupportConcept
Quality of Feedback2.990.631.385.38

National Statistics by Domain

Grantee-level dimension scores are averaged to produce grantee-level domain scores.* Previous large-scale studies of CLASS have shown that the average preschool classroom scores are higher in the domains of Emotional Support and Classroom Organization than in the domain of Instructional Support.

OHS CLASS® Descriptive Statistics, 2017
National Grantee-Level Scores by Domain
DomainMeanStandard DeviationMinimumMaximum
Emotional Support6.070.305.086.89
Classroom Organization5.830.404.176.73
Instructional Support3.000.531.934.96

*Note: To calculate the Emotional Support domain, subtract the Negative Climate score from 8, add the Positive Climate, Teacher Sensitivity, and Regard for Student Perspective scores, then divide by 4.

Distribution by Domain

The following table and graphs provide additional information on how grantee-level domain scores are distributed nationally.

OHS CLASS® Descriptive Statistics, 2017
National Distribution of Grantee-Level Domain Scores
DomainLowest 10%Median (50%)Highest 10%
Emotional Support5.70246.096.48
Classroom Organization5.32645.856.33
Instructional Support2.30952.973.65


Emotional Support, Grantee-Level Distribution, 2017


Classroom Organization, Grantee-Level Distribution, 2017


Instructional Support, Grantee-Level Distribution, 2017


Mean: the average value, calculated by summing all scores and dividing by the number of scores
Median: the middle value, where half the scores are below this point and half are above it
N: the total number of values in a set
Standard Deviation: a value that shows how much variation exists in a set of data. There are two types of standard deviation (i.e., sample and population). We use the population standard deviation because this dataset includes all 2017 CLASS scores.