We identify three aspects of scientific thinking beyond the control-of-variables strategy that we claim are essential for students to master as a foundation for skilled scientific thinking. The first is strategic and involves the ability to coordinate effects of multiple causal influences on an outcome. The second is a mature understanding of the…

Thirty fourth-grade students participated in an extended intervention previously successful in fostering skills of scientific investigation and inference, notably control of variables (COV). The intervention was similarly successful for a majority of students in the present study, enabling them to isolate the three causal and two noncausal…

D. Klahr and M. Nigam (2004) make a case for the superiority of direct instruction over discovery learning in students' mastery of the control-of-variables strategy central to the scientific method. In the present work, we examine acquisition of this strategy among students of the same age as those studied by Klahr and Nigam, as well as follow…

Examining the metaphor of the child, or lay adult, as an intuitive scientist results in a theory of the development of scientific thinking centering on progressive differentiation and the coordination of theory and evidence. This metacognitive and strategic development requires thinking about theories and evidence. (SLD)