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Development and Validation of a Concept Inventory for Earth System Thinking Skills

Abstract

System thinking in an important area of study across STEM and non-STEM disciplines. The Earth system approach that drives the geosciences and is essential to issues of sustainability makes system thinking a critical skill in geoscience education. A key area in understanding the development of system thinking skills in the geosciences relies on the development of a tool to assess Earth system thinking skills. This paper documents the development process of the Earth system thinking concept inventory (EST CI). The instrument was administered in multiple iterations using Amazon’s Mechanical Turk (MTURK) (n = 1004). Evidence of validity and reliability was accrued using elements of both classical test theory (CTT) and item response theory (IRT). Key metrics used in this study include item difficulty, item discrimination, infit and outfit statistics, differential item functioning, item-person maps, item characteristic curves, and KR-20 statistics. By using these two approaches to validity and reliability in a complementary fashion, we were able to take an iterative approach to provide robust evidence for both validity and reliability. Additionally, the instrument is semi-customizable as language regarding feedbacks can be shifted between using “positive” and “negative” or “reinforcing” and “balancing” terminology, with the latter resulting in better reliability among a largely novice audience.

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modified from Soltis et al. (2019))

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We would like to thank Chris Schnittka, Stephanie Shepherd, Joni Lakin, Anne Gold, Leilani Arthurs, Juliette Rooney-Varga, Lisa Gilbert, and Hannah Scherer for their insights and discussions that were invaluable in the development and revision of this instrument.

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Correspondence to Nicholas Andrew Soltis.

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Soltis, N.A., McNeal, K.S. Development and Validation of a Concept Inventory for Earth System Thinking Skills. Journal for STEM Educ Res 5, 28–52 (2022). https://doi.org/10.1007/s41979-021-00065-z

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