Published online by Cambridge University Press: 26 September 2008
Kindergarteners, grouped according to number conservation ability, were asked to explain their choices of more and less in a series of parallel tasks requiring comparative judgements of continuous quantities. Errors on less tasks, as well as correct choices of more, were often determined by the non-linguistic strategy of choosing the greater amount. Non-conservers were more likely than conservers or transitional conservers to rely on this strategy. Furthermore, mature semantic knowledge of more was found to precede the development of a similar understanding of less. Non-conservers were less likely than conservers or transitionals to have a mature understanding of either term.