This research consists of a longitudinal study of 12 female elementary preservice teachers' conceptual understanding over the course of several months. The context in which the participants received instruction was in an inquiry-based physics course, and the targeted science content was the cause of moon phases. Qualitative research methods,…

Describes aspects of qualitative research having the potential of providing guidance to change agents in designing effective strategies to bring about desired changes in science education. A discursive approach involving the method of collecting and simultaneously analyzing data ("grounded theory") is described. (Author/JN)

Discusses key processes in conducting qualitative research: problem definition, gaining access to collect data, modes of data collection, modes of analysis, and presentation of findings. Compares qualitative with quantitative research methods. (JN)

Examined three methods which can be used to pool single-item-per-subject data collected in intensive time-series studies, determining if method of pooling has an effect on subsequent data analysis. Methods examined were based on simple averaging, difficulty weightings of averages, and the application of the Rasch logistic model. (JM)

Argues that secondary analysis of existing data sets provides an important opportunity for science education researchers. Reviews basic arguments for secondary analysis (quality, cost, scientific merit of multiple analyses of a common data set), discusses new forces fostering these analyses, and provides three examples of secondary analysis…

Reports research concerning the definition of variables by pupils ages 12 to 14 during investigative work. Findings suggest that an increase in the complexity of an investigation lowers the ability to identify relevant variables and substantive concepts intrude on the ability to define the appropriate dependent variable and to control variables.…

Several studies of the validity of the intensive time-series design have revealed a post-intervention increase in the level of achievement data (the "momentum effect"). Reports on the development and use of a technique to study the effect as it is observed in several data sets on the learning of plate tectonics. (Author/JN)

Differentiating between time-series design and time-series analysis, examines design considerations and reanalyzes data previously reported by Mayer and Kozlow in this journal. The current analysis supports the analysis performed by Mayer and Kozlow but puts the results on a somewhat firmer statistical footing. (Author/JN)