Investigating students’ perceptions of instructional strategies to establish social presence

Social presence is a popular construct used to describe how people socially interact in online courses. Online educators continue to try different ways to establish and maintain social presence in online courses. However, research to date has not identified which strategies, or types of strategies, are best for establishing social presence. We investigated student perceptions of various strategies of establishing and maintaining social presence using a mixed methods case study approach in two different fully online courses. Results suggest that students are more interested in connecting with their instructor than their peers; different students like different social presence strategies; and students have different overall social presence needs. Various strategies and implications for practice are addressed throughout.     

Comparing Models of Nature of Science Dimensionality Based on the Next Generation Science Standards

Instruments measuring understanding of the nature of science (NOS) are required if educational institutions intend to use benchmarks or examine the effects of interventions targeting students’ NOS development. Compared to other constructs, NOS understanding is complex, having been the subject of debate among scholars in both its substance and its dimensionality. This complexity invites challenges in defining what is to be measured. Drawing from the perspective that policy reform documents provide pragmatic consensus-based definitions of NOS, this study investigated how well the dimensionality described in the NOS component of the Next Generation Science Standards (NGSS) framework matched the empirical structure of data collected from a set of secondary-school students’ responses to an NOS instrument comprising multiple-choice and Likert-scale items. Using multidimensional item response modeling to compare structures of NOS dimensionality, we found that treating NOS as comprising multiple dimensions—as defined by the themes in the NGSS NOS framework—resulted in a better fitting model than when treating NOS as a single dimension. The multidimensional model also had fewer poorly functioning items and revealed NOS profiles that otherwise would have been masked in a model treating NOS as a single dimension. These results provide support for the NOS NGSS framework and contribute to the ongoing discussion about the dimensionality of NOS.