Danielle Murphy, Ravit Golan Duncan, Clark A. Chinn, Joshua Danish , Cindy E. Hmelo-Silver, Jinzhi Zhou, Ryan Zachary

Original article: Murphy, D., Duncan, R. G., Chinn, C. A., Danish, J., Hmelo Silver, C. E., Zhou, J., & Ryan, Z. (2025). Elementary Students' Metacognitive Knowledge of Epistemic Criteria. Journal of Research in Science Teaching, 62(7), 1721-1742.

https://onlinelibrary.wiley.com/doi/full/10.1002/tea.22030

In today’s science classrooms, students are often asked to build, evaluate, and improve scientific models. But many students are not explicitly taught how to judge whether a model is good or why certain standards matter. This study explores how fifth-grade students learn to use and understand criteria for evaluating scientific models, an important part of effective science teaching and learning.

Why it Matters 

In science, experts use shared standards—called epistemic criteria—to evaluate models, arguments, and investigations. These criteria help scientists decide what counts as strong, reliable, and useful knowledge. Teaching students to use these same criteria can strengthen critical thinking, support scientific investigations, and help students evaluate scientific claims they encounter in everyday life.

Key Findings for the Classroom

This study took place in two fifth-grade classrooms during a model-based inquiry unit on eutrophication, a real-world environmental issue that can cause harmful algal blooms and fish deaths. Instead of giving students a fixed checklist, teachers guided them in creating their own class criteria for what makes a strong scientific model. Students decided that good models should:

• Clearly explain what is happening 
• Be based on evidence 
• Be easy to understand 

Throughout the unit, students used these criteria to build models, give peer feedback, and revise their work. After the unit, students discussed which criteria were most important and explained their reasoning. Students applied the criteria and reflected on why the criteria mattered. These conversations helped students think more deeply about how scientific models are evaluated and why certain standards matter in science, rather than relying only on teacher direction.

The results show that students not only understood the criteria but could also explain why they matter. For example, students said that using evidence makes models more accurate and believable, while clear explanations help others understand scientific ideas. Students also made deeper connections by comparing criteria, recognizing overlaps, and identifying which ideas were most essential.

Practical Tips for Teachers

• Involve students in creating and revising criteria for strong scientific models 
• Support students in applying these skills to real-world scientific information 
• Use peer discussion and debate to build deeper understanding