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School science students can benefit greatly from participation in studentdirected, open-ended scientific inquiry projects. For various possible reasons, however, students tend not to be engaged in such inquiries. Among factors that may limit their opportunities to engage in open-ended inquiries of their design are teachers' conceptions about science. To explore possible relationships between teachers' conceptions about science and the types of inquiry activities in which they engage students, instrumental case studies of five secondary science teachers were developed, using field notes, repertory grids, samples of lesson plans and student activities, and semistructured interviews. Based on constructivist grounded theory analysis, participating teachers' tendencies to promote student-directed, open-ended scientific inquiry projects seemed to correspond with positions about the nature of science to which they indicated adherence. A tendency to encourage and enable students to carry out student-directed, open-ended scientific inquiry projects appeared to be associated with adherence to social constructivist views about science. Teachers who opposed social constructivist views tended to prefer tight control of student knowledge building procedures and conclusions. We suggest that these results can be explained with reference to human psychological factors, including those associated with teachers' self-esteem and their relationships with knowledge-building processes in the discipline of their teaching.

While much of the work in the public understanding of science has focused on the public's appreciation of science and their familiarity with key scientific concepts, understanding the processes involved in learning science has largely been ignored. This article documents a study of how particular members of the public learn about radiation and radioactivity, and proposes a model to describe their learning—the Informal Conceptual Change Model [ICCM]. ICCM is a multidimensional framework that incorporates three theoretical dimensions—the cognitive, conative, and affective. The paper documents each of these dimensions, and then illustrates the model by drawing upon data collected in a case study. The emphasis of the analysis is on understanding how the members of the public living in an area with high levels of background radiation learn about the science of this potential health threat. The summarizing comments examine the need for a greater awareness of the complexities of informal learning.

This article presents the results of a comparative study of two groups of learners. The study explores whether their feelings about a potentially emotive topic-radioactivity in this caseinfluence their approach to learning.

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