A common mistake in adding fractions involves the confusion betwen the concepts of fraction and ratio. A coherent system to operate with ratios is developed. (MNS)

Reports on the effectiveness of a theoretically based computer spelling program designed to help learning disabled students practice lists of words. The program employs a type of computer response called Imitation-Plus-Modeling. (AEA)

Describes a microcomputer-based system for diagnosing children's multiplication errors which incorporates the knowledge base of all known systematic multiplication errors, and utilizes a modular approach to cope with the program's complexity. Each module's function, how the programs interact, and the design of pupil-machine interaction are…

Evaluated the effects of stimulus complexity and rule usage on a visual perspective-taking task administered to preschoolers, first, third, and fifth graders, and adults. Errors decreased with age, and more errors occurred with the more complex visual arrays. Very young children could not reliably match a photograph to a physical array. (Author/RH)

Two studies of children learning to read (one before the introduction of phonics instruction, the other while phonics instruction was being given) found that error-target similarity increased with reading attainment. This suggests that while reading aloud, considerable knowledge of spelling develops independently of explicit use of phonics. (CMG)

A model of subtraction development and the computing difficulties and research issues suggested by the model are outlined. Demands of simultaneous processes, difficulties with informal subtraction, and the impact on the counting-up procedure are discussed. (MNS)

Approaches proposed for educational diagnostic assessment are reviewed and identified as deficit assessment and error analysis. The development of diagnostic instruments may require a reexamination of existing psychometric models and development of alternative ones. The psychometric and content demands of diagnostic assessment all but require test…

Midterm grades of students are compared to the grade the student gave the professor on his teaching effectiveness. A better than chance correspondence shown in a one-way analysis of variance is discussed in relation to subordinate-supervisor ratings. (Author/KM)

Revised version of a paper presented at the Seminar on English Teaching in Iran, Tehran, April 1971. (DD)

Data from two studies at Gladstone High School in California support the assumption that daily writing and daily correction and grading based exclusively on mechanics do improve a student's ability to write more correctly by eliminating common errors. (Author)