195-201 Systematic Errors in the Four Vertical Algorithms in Normal and Handicapped Populations L. S. Cox , pp. 202-220 Further Work on Verbalization of Discoveries Larry Sowder , pp. 222-227 Transfer Effects as a Function of Variety of Method and Ability Level in Elementary Mathematics John K. Burton, Elmer A. Lemke, and Jeral R. Williams , pp. The Relationship of Area Conservation to Area Measurement as Affected by Sequence of Presentation of Piagetian Area Tasks to Boys and Girls in Grades One through Three Thalia Taloumis , pp. 253-282 Research reported during the 1974 calendar year is listed, accompanied by brief annotations of findings.
Instructional strategies consist of sequences of informational displays.
For each variable several principal parameter values were suggested. The instructional strategy system described and its accompanying flow chart conventions should have value in the construction of instructional theory, the review of instructional research, the analysis of existing instructional strategies, and the design of instructional materials and systems. Children were screened for adequate knowledge of basic facts and for receiving prior instruction on the computational processes. Systematic errors contained a recurring incorrect computational process and were differentiated from careless errors and random errors. Errors were studied within levels of computational skill for each algorithm.