Development of the Newtonian Gravity Concept Inventory

Williamson, Kathryn E. and Willoughby, Shannon D. and Prather, Edward E. (2013) Development of the Newtonian Gravity Concept Inventory. Astronomy Education Review, 12 (1). ISSN 15391515


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We introduce the Newtonian Gravity Concept Inventory (NGCI), a 26-item multiple-choice instrument to assess introductory general education college astronomy (“Astro 101”) student understanding of Newtonian gravity. This paper describes the development of the NGCI through four phases: Planning, Construction, Quantitative Analysis, and Validation. We discuss the evolution of the instrument through three versions, including the refinement of a set of four concept domains and nine examples of items to illustrate how expert review, student interviews, and Classical Test Theory statistics informed our approach. We conclude that the NGCI is a reliable and valid instrument.

Item Type: Article
Subjects: Astronomy Education Research
Depositing User: Mr Saeed Salimpour
Date Deposited: 06 Jul 2017 07:06
Last Modified: 19 Aug 2018 09:25

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