Examines the relationship between formal operational reasoning and two language variables--subordinate clauses and tentative statements. Supports Piaget's position of independence between linguistic and cognitive development, showing how subordinate clause use and tentative statement use are not related significantly to performances on reasoning…

Black students that were grouped for English ability by their standardized test scores translated a standard English text into black dialect. Analytical data show group differences in dialect facility that correlate to standard English ability, suggesting that language development affects both dialect performance and standard English learning. (RL)