This study identifies the most common biological concepts presented in elementary science textbooks in Taiwan. The concepts focus on living things, animals, and plants in grades one through four. Three major areas of concern are: attributes of the three related concepts; development of the concepts focusing on content organization and their…

Two studies were conducted to clarify the influence of experiences and aptitudes on male-female differences in formal thought. Participants were 788 seventh-, ninth-, and eleventh-graders in three school districts differing in location, socioeconomic composition, and course offerings. Formal thought was measured with tasks involving proportional…