Developed by Jeffrey Marx and Jack Wilson
|Purpose||To assess students’ understanding of the basic of electricity and magnetism, measure progress of individual students, relate responses to misconceptions, and gauge the effectiveness of teaching styles.|
|Focus||Electricity / Magnetism Content knowledge (electric fields and force, magnetic fields and forces, electrostatic potential, Maxwell's equations, induced currents)|
Sample questions from the DEEM:
This is the third highest level of research validation, corresponding to at least 3 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 DEEM were developed based on student interviews, expert input, instructional objectives, literature review and observations of students. Questions were refined through expert review, additional student interviews and analysis of student performance on the test. Appropriate statistical analyses of reliability, difficulty, discrimination and internal consistency were conducted, and values found to be above acceptable thresholds. Analysis of possible gender bias was also conducted, and the questions on the DEEM are not biased overall. The DEEM has been used with over 600 students at one institution. Results are published in a doctoral thesis.
- J. Marx, Creation of a Diagnostic Exam for Introductory, Undergraduate Electricity and Magnetism, Rensselaer Polytechnic Institute, 1998.
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The average score on Version 3.0 of the DEEM was 24 (± 8.0) on the pre-test and 37 (± 9.1) on the post-test out of 70. The pecent gain is 27.2%. The most recent version is Version 4.0, but typical scores are not available for this version.
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The latest version of the DEEM, released in 1998, is version 4.0.