About the e-rater® Scoring Engine

What Is the e-rater® Engine?

The e-rater® engine is an ETS capability that identifies features related to writing proficiency in student essays so they can be used for scoring and feedback. Among other applications, e-rater is used within the Criterion® Online Writing Evaluation Service.

Who Uses the e-rater Engine and Why?

In the context of the Criterion application, students use the e-rater engine's feedback to evaluate their essay-writing skills as well as to identify areas that need improvement. Teachers use the Criterion service to help their students to develop their writing skills independently and receive automated, constructive feedback.

How Does the e-rater Engine Grade Essays?

The e-rater engine provides a holistic score for an essay as well as real-time diagnostic feedback about grammar, usage, mechanics, style and organization, and development. This feedback is based on natural language processing research specifically tailored to the analysis of student responses, and is detailed in ETS’s research publications.

Where Can I Find Out More About the e-rater Engine?

For more information regarding the use of the e-rater engine, read "e-rater as a Quality Control on Human Scores" in the April 2005 issue of R&D Connections. See Automated Scoring and Natural Language Processing for more information about the e-rater engine's capabilities.