Physics Inventory of Quantitative Literacy (PIQL)

Developed by Suzanne White Brahmia, Alexis Olsho, Trevor I. Smith, Andrew Boudreaux, Philip Eaton, and Charlotte Zimmerman

Purpose
To assess quantitative literacy over the span of students’ instruction in introductory physics.
Format Pre/post, Multiple-choice, Multiple-response
Duration 30-45 min
Focus Scientific reasoning (proportional reasoning, reasoning with signed quantities, co-variational reasoning)
Level Intro college
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RESEARCH VALIDATION
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Gold Star Validation
This is the highest level of research validation, corresponding to all seven of the validation categories below.

Research Validation Summary

Based on Research Into:

  • Student thinking

Studied Using:

  • Student interviews
  • Expert review
  • Appropriate statistical analysis

Research Conducted:

  • At multiple institutions
  • By multiple research groups
  • Peer-reviewed publication

The multiple-choice questions on the PIQL were developed based on a bank of questions from previous work of some of the authors, items from mathematics education research, including some from the Precalculus Concept Assessment and some questions were newly developed by the authors. The questions were reviewed by experts and tested in student interviews, and revised. The PIQL was iteratively given as a pre- and post-test to introductory physics students over 8 terms, and revised. Statistical analysis of difficulty, discrimination and reliability were performed, and reasonable results found. A confirmatory factor analysis was performed to confirm the three-factor structure of the test (ratios and proportions, covariation, and signed quantities/negativity). The developers did not find evidence for this three factor structure, and followed up with an exploratory factor analysis, where they found a unidimensional structure. The PIQL has been given to over 2000 students at two institutions and the results are published in one peer-reviewed paper. 

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Typical Results

Figure 7 from Brahmia et al. 2021. Three snapshots of PIQL results in introductory course sequence: before mechanics “PreMech”, after mechanics but before electricity & magnetism “PostMech”, and after electricity & magnetism but before thermodynamics and waves “PostEM”. The data in Fig. 7 combine all four administrations of PIQL v2.2, including 2,758 data sets and 2,078 individuals. A one-way analysis of variance showed no significant difference between the four academic terms, F (3, 2754) = 1.6, p = 0.2. The PreMech mean and standard deviation are 9.6 ± 3.7 out of 20. Students’ PQL increases slightly with instruction, with mean scores 10.8 ± 4.3 for PostMech and 11.3 ± 4.5 for PostEM.


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The most recent version of the PIQL, released in 2021, is version 2.2.