Explanations about Science in Parent-Child Conversations Maureen A. Callanan Explanatory conversations between parents and children have been argued to be a context in which children develop intuitive theories about the world. There is some controversy, however, about what such conversations can tell us regarding cognitive change in children. On the one hand several researchers have argued for the importance of exploring natural conversations for clues about how children revise their understanding of the world. On the other hand, critics of this approach point out the problems of assessing what children learn as a result of such conversations. This presentation will focus on research from several studies of parent-child conversations about science, including naturally-occurring conversations in a museum context, more controlled studies of conversation while engaging in experimentally-designed tasks, and diary studies of children's "why" questions. Evidence against the transmission view of knowledge development will be discussed. At the same time, examples will be used to help articulate the methodological problems that need to be solved if conversational data can be utilized to learn more about children's conceptual change in rich domains.