The purpose of this study was to evaluate the effectiveness of a simple contingency contracting intervention on the correct use of punctuation marks in freely produced texts by elementary school children with learning disabilities. This approach can be considered a promising strategy for facilitating the development of academic skills in…

This paper investigated six to nine year old children's ability to use contractive and possessive apostrophes, the effects of type and token frequency, and the effect of teaching on this ability. Apostrophes provide an interesting opportunity to examine the basis of frequency effects in rule inference, as type and token frequencies dissociate in…