In the hope of delimiting a technique for classifying spelling errors, the writer will review a number of proposed systems of classification. Each system will be described and evaluated in terms of its objectivity, ease and clarity of administration, and its value for the diagnostician. In order that their evolution may be more apparent, the studies are described in chronological order from the earliest in 1900 to the present.The earliest system for classifying spelling errors, in any of the bibliographies of studies related to spelling used by the writer 3 '