A content-oriented analysis of written solutions to test items in Israeli high school graduation examinations in mathematics yielded a system of six error categories: misused data, misinterpreted language, logically invalid inference, distorted theorem or definition, unverifed solution, and technical error. This system enabled most of the documented errors to be classified. A reliability test showed that the categories are inclusive and mutually exclusive.
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Movshovitz‐Hadar et al. (1987) studied this question.
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