How CER Makes Science Make Sense
Reading Claims, Evidence, and Reasoning by Dean M. Martin and Katherine L. McNeill really got me thinking about how we teach science in elementary classrooms. The article focuses on this fra... See More
Reading Claims, Evidence, and Reasoning by Dean M. Martin and Katherine L. McNeill really got me thinking about how we teach science in elementary classrooms. The article focuses on this framework called CER, which stands for Claims, Evidence, and Reasoning, and it’s all about helping students not just do experiments, but actually make sense of what they see and explain it clearly. Too often, I notice students in science class just record data or answer questions without really understanding the “why” behind it. That’s why I liked this article so much—it offers a concrete, practical way to get students thinking critically about their work.
The basic idea of CER is simple but powerful. A claim is basically an answer to a scientific question. Evidence is the data that backs up that claim, and reasoning explains why the evidence actually supports the claim. What’s great about this framework is that it gives students a clear path to organize their thoughts instead of just writing random observations. Martin and McNeill explain that students often struggle with reasoning because they don’t connect their evidence to scientific principles, and CER helps fix that. It’s kind of like giving students a map for thinking scientifically, and I can see how that could make a huge difference in how confident and capable they feel in science.
The article walks through a fifth-grade classroom using CER during a unit on simple machines, and I found this really relatable. Students tested different levers, collected data on how effective they were, and then had to explain their results using CER. It’s one thing to say, “This lever lifted the weight,” but it’s another to explain why it worked based on what they know about levers and force. I loved seeing the focus on reasoning, because that’s the part students usually skip over, but it’s where real understanding happens. The article also talks about how teachers scaffold the process. At first, the teacher models what a claim, evidence, and reasoning explanation looks like. Then students practice with guidance, and eventually they do it on their own. I really like this approach because it builds confidence while still challenging students to think. I could definitely see myself using this strategy in my own classroom, especially during hands-on units where kids are experimenting and collecting data.
One thing I appreciated is that CER also encourages communication. Students aren’t just thinking to themselves—they’re explaining their reasoning clearly, sometimes orally and sometimes in writing. That helps them develop skills that go beyond science class. Being able to justify ideas with evidence is something that’s useful in math, reading, or even everyday problem-solving. So even though the article is about science, I can see how the framework could have benefits across the curriculum.
The authors are clear and practical, which I appreciate. They provide real examples from the classroom instead of just theory. I could picture myself stepping into this classroom and seeing students working through the process. That makes the article feel immediately usable, which is refreshing compared to some educational research that’s heavy on theory but light on application.
That said, there are a couple of limitations. The study is based on just one fifth-grade classroom, so it’s hard to know how well CER would work in different settings or with older students. I also wish there was more discussion on how to adapt it for other topics in science or integrate it with subjects like math or ELA. But even with those limitations, the article does a great job of showing how to make science more meaningful and engaging for students.
Overall, I really enjoyed this article and would give it four out of five stars. It’s clear, practical, and really encourages critical thinking, which is exactly what we want for our students. The one star I took off is just because I wanted a little more on flexibility and application beyond the one classroom. Even so, I walked away feeling like CER is a tool I could bring into my own teaching tomorrow. It’s a framework that makes students’ thinking visible, helps them make connections, and ultimately helps them understand science rather than just complete tasks. For me, that’s the kind of teaching I strive for—where students are actively thinking, reasoning, and truly making sense of what they’re learning.