ATiNG IT POINTS OF VIEW OR OPINIONS

,Pitotal of 224 subjects in grades 6, 8, high school,.and college .solvedpeoblems requiring comprehension of the logical connectives and, or only. if, And if and only if, as well'as the terms is and is not. Half the subjects were required merely-to encode the connectives; the other half were required to: combine. as well as encode theM. Problems1,,were pre7. eien,ted in two replicetions-( er. two sessions) via two 'different content vehycle0. Quantitative ayr lyses revealed signiEidant effects of task,,, 7 a e,:session, and connective,with comprehensian'Of different connectives ',developing at different rates. In general comprehension of the conjunctive-connective was easiest; coMpreheilsion of the conditional and biconditionaf connectives was Most difficult. Qualitative analyses indicated just how the logical conneaives were interpreted at each grade level, and also