Developed by Kathryn Williamson and Shannon Willoboughby
|Purpose||To assess introductory general education college astronomy (“Astro 101”) students' understanding of Newtonian gravity.|
|Focus||Astronomy Content knowledge (directionality of gravity, force law, independence of other forces, thresholds related to gravity)|
Sample questions from the NGCI:
This is the second highest level of research validation, corresponding to at least 5 of the validation categories below.
Research Validation Summary
Based on Research Into:
- Student thinking
- Student interviews
- Expert review
- Appropriate statistical analysis
- At multiple institutions
- By multiple research groups
- Peer-reviewed publication
The multiple-choice questions on the NGCI were developed based on previous research on student ideas about gravity. The authors started with concept map with four aspects of gravity (concept domains), which were used to create the initial set of test questions. The questions underwent several rounds of testing and revision, which consisted of giving the questions to students and analyzing the responses, student interviews and expert review. Appropriate statistical analysis of reliability, difficulty and discrimination were conducted and reasonable values found. A wide range of normalized gain scores were found for different courses, indicating that that NGCI is sensitive to differences in instruction. The NGCI has been used with over 900 students at six institutions and results are published in one peer-reviewed publication.
- K. Williamson, S. Willoughby, and E. Prather, Development of the Newtonian Gravity Concept Inventory, Astron. Educ. Rev. 12 (1), 1 (2013).
- K. Williamson and S. Willoughby, Student Understanding of Gravity in Introductory College Astronomy, Astron. Educ. Rev. 11 (1), 1 (2012).
We don't have any translations of this assessment yet.
If you know of a translation that we don't have yet, or if you would like to translate this assessment, please contact us!
Login or register to download the answer key and an excel scoring and analysis tool for this assessment.
Typical scores on the NGCI as given in Table 2 of Williamson and Willoughby 2013:
Coming soon: The PhysPort Assessment Data Explorer
Start learning more from your tests.
- Get 1-click statistics
- Compare to students like yours
- Get practical, personalized recommendations
The latest version of the NGCI, released in 2013, is version 3.