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This report evaluates the construct coverage of the e-rater ® scoring engine. The matter of construct coverage depends on whether one defines writing skill, in terms of process or product. Originally, the e-rater engine consisted of a large set of components with a proven ability to predict human holistic scores. By organizing these capabilities into features, e-rater researchers organized the e-rater engine along the lines of trait scoring, which recognizes that essay quality has severaldoi:10.1002/j.2333-8504.2009.tb02158.x fatcat:ej6xblz66rgmvg7mk23h6aiyrm