Recent studies have shown that children with mathematics difficulties (MD) have weaknesses in multiple areas of mathematics. Andersson, for example, recently found that children with MD perform significantly worse than other children on clock reading tasks. The present study builds on this recent finding and aims at a more profound understanding…

Examined computational errors made by educable mentally retarded students on the arithmetic subtest of the Wide Range Achievement Test. Retarded students had a lower percent of grouping and inappropriate inversion errors and a higher percent of incorrect operation errors than regular students had in Engelhardt's study. (Author)

The "state of the art" in the three fields of contrastive analysis, error analysis and interlanguage is critically examined from the point of view of evolving an explanatory theory of a second language learner's performance. Each field is discussed with respect to its outreach, theoretical assumptions, methodology, claims and empirical…