The Intelligent Essay Assessor: Applications to Educational Technology

Peter W. Foltz, Darrell Laham, and Thomas K. Landauer

Abstract

The Intelligent Essay Assessor (IEA) is a set of software tools for scoring the quality of essay content. The IEA uses Latent Semantic Analysis (LSA), which is both a computational model of human knowledge representation and a method for extracting semantic similarity of words and passages from text. Simulations of psycholinguistic phenomena show that LSA reflects similarities of human meaning effectively. To assess essay quality, LSA is first trained on domain-representative text. Then student essays are characterized by LSA representations of the meaning of the words used, and they are compared with essays of known quality in regard to their degree of conceptual relevance and the amount of relevant content. Over many diverse topics, the IEA scores agreed with human experts as accurately as expert scores agreed with each other. Implications are discussed for incorporating automatic essay scoring in more general forms of educational technology.

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