As educators, we often seek to engage students' prior knowledge to help them learn new and potentially difficult science content. However, sometimes our experiences with the world lead us to create misconceptions that run counter to the scientific consensus. Refutational texts have been shown to be more effective at changing individuals'…

Characteristics of 11 Repgrid indices of cognitive structure, particularly Smith and Leach's hierarchical complexity index, are investigated among boys and girls, aged 9-15. The Smith & Leach index is shown to be significantly reliable; but in common with seven indices of cognitive differentiation, it is of dubious validity. (Author/GDC)