There are some fundamental--i.e., "essential"--differences between conceptual change theory and a rigorously applied discourse approach to the question of what and how people know. In this rejoinder, I suggest that the differences are paradigmatic because, among others, the units of analysis used and the data constructed are irreconcilably…

Over the past three decades, science educators have accumulated a vast amount of information on conceptions--variously defined as beliefs, ontologies, cognitive structures, mental models, or frameworks--that generally (at least initially) have been derived from interviews about certain topics. During the same time period, cultural studies has…