This article demonstrates how the Comparative Method can be applied to cross-linguistic research on language acquisition. The Comparative Method provides a systematic procedure for organizing and interpreting acquisition data from different languages. The Comparative Method controls for cross-linguistic differences at all levels of the grammar and…

Shows that Rispoli's (1999) suggestion that previous studies arguing for a contingency between the case of subject pronouns and the presence/absence of verbal agreement in the acquisition of English suffers from methodological problems is itself based on a methodology that unnecessarily biases his study against the predicted contingencies.…

A study of 5-year olds' ability to distinguish promises from predictions was suspected to have achieved its results due to methodological problems. A similar study with 32 children ages 5 to 6 that used several variations of the previous study's procedures was found to have similar results, suggesting the earlier findings were an accurate…

Various theories of learning for the categories "count noun" and "mass noun" are compared. It is argued that children assign words to these categories on the basis of intuitions arising from perception that are relevant to Macnamara's (1986) definitions of the categories. (39 references) (GLR)