This study aims to describe the history of interdisciplinary education and the current trends and to elucidate the conceptual framework and values that support interdisciplinary science teaching. Many science educators have perceived the necessity for a crucial paradigm shift towards interdisciplinary learning as shown in science standards. Interdisciplinary learning in science is characterized as a perspective that integrates two or more disciplines into coherent connections to enable students to make relevant connections and generate meaningful associations. There is no question that the complexity of the natural system and its corresponding scientific problems necessitate interdisciplinary understanding informed by multiple disciplinary backgrounds. The best way to learn and perceive natural phenomena of the real world in science should be based on an effective interdisciplinary teaching. To support the underlying rationale for interdisciplinary teaching, the present study proposes theoretical approaches on how integrated knowledge of teachers affects their interdisciplinary teaching practices and student learning. This research further emphasizes a need for appropriate professional development programs that can foster the interdisciplinary understanding across various science disciplines.

Recent calls for college biology education reform have identified “pathways and transformations of matter and energy” as a big idea in biology crucial for students to learn. Previous work has been conducted on how college students think about such matter-transforming processes; however, little research has investigated how students connect these ideas. Here, we probe student thinking about matter transformations in the familiar context of human weight loss. Our analysis of 1192 student constructed responses revealed three scientific (which we label “Normative”) and five less scientific (which we label “Developing”) ideas that students use to explain weight loss. Additionally, students combine these ideas in their responses, with an average number of 2.19 ± 1.07 ideas per response, and 74.4% of responses containing two or more ideas. These results highlight the extent to which students hold multiple (both correct and incorrect) ideas about complex biological processes. We described student responses as conforming to either Scientific, Mixed, or Developing descriptive models, which had an average of 1.9 ± 0.6, 3.1 ± 0.9, and 1.7 ± 0.8 ideas per response, respectively. Such heterogeneous student thinking is characteristic of difficulties in both conceptual change and early expertise development and will require careful instructional intervention for lasting learning gains.

Global carbon cycling describes the movement of carbon through atmosphere, biosphere, geosphere, and hydrosphere; it lies at the heart of climate change and sustainability. To understand the global carbon cycle, students will require interdisciplinary knowledge. While standards documents in science education have long promoted interdisciplinary understanding, our current science education system is still oriented toward single-discipline-based learning. Furthermore, there is limited work on interdisciplinary assessment. This article presents the validated Interdisciplinary Science Assessment of Carbon Cycling (ISACC), and reports empirical results of a study of high school and undergraduate students, including an analysis of the relationship between interdisciplinary items and disciplinary items. Many-faceted Rasch analysis produced detailed information about the relative difficulty of items and estimates of ability levels of students. One-way ANCOVA was used to analyze differences among three grade levels: high school, college Freshman-Sophomore, college Junior-Senior, with number of science courses as a covariate. Findings indicated significantly higher levels of interdisciplinary understanding among the Freshman-Sophomore group compared to high school students. There was no statistically significant difference between Freshman-Sophomore group and Junior-Senior group. Items assessing interdisciplinary understanding were more difficult than items assessing disciplinary understanding of global carbon cycling; however, interdisciplinary and disciplinary understanding were strongly correlated. This study highlights the importance of interdisciplinary understanding in learning carbon cycling and discusses its potential impacts on science curriculum and teaching practices. K E Y W O R D S global carbon cycling, interdisciplinary assessment, interdisciplinary learning, interdisciplinary understanding, Rasch analysis

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Motivation in science learning is believed to be essential for students' pursuit of college-level studies and lifelong interest in science. Yet, the trend of low levels of motivation in learning science continued in college can be linked to a national concern about low scientific literacy levels and science career aspirations. To diagnose the current status of motivation of college students, it is important to have an instrument that can assess students' motivation. The purpose of the present study is to examine the level of motivation of college students and establish the validity and reliability of a motivation questionnaire-the Science Motivation Questionnaire II (SMQ II) developed by Glynn et al. (2011)-using the Rasch-Andrich rating scale model. The original instrument consists of 25 items allocated in five sub-factors. Both person separation reliability and item separation reliability were excellent. The item separation index indicated good variability of the items and the five rating scale functioned well. All Infit and Outfit measures in the Rasch analysis demonstrated a lack of unidimensionality of the science motivation construct in the SMQ II, which supports the deletion of two items to satisfy the unidimensional structure.