Dylan Smith

This is a mischaracterization of CLT. Just because a chart or any other content is complex or takes time to understand does not mean it is causing cognitive overload. CLT emphasizes optimizing the intrinsic cognitive load of the learning task while minimizing extraneous cognitive load. However, complexity and cognitive overload are not the same thing. CLT is not an argument for reducing complexity; it is about managing complexity. Learning often requires students to grapple with challenging ideas, analyze relationships, and construct meaningful mental models. The teacher’s role is to optimize intrinsic load by minimizing extraneous load, ensuring that students’ limited working memory is devoted to the productive thinking required by the task rather than consumed by unnecessary processing demands. Framing any challenging or complex learning task as “cognitive overload” misrepresents CLT and overlooks its central insight: working memory is limited, but effective instruction can help students optimize that limited capacity in ways that support learning. So the answer is yes: cognitive overload is always detrimental to learning. When working memory is overloaded, students are unable to effectively process, organize, and integrate new information into long-term memory.

I’ve been posting a lot lately and wanted to dial things down, but I have to speak up here. When teaching area of circle to seventh graders, I’d ask students to bring in circular objects from home, such as pots and pans. They would be instructed to group themselves into 2s and 3s to measure the circumference and diameter of 3 or 4 objects using a tailor’s (cloth) tape measure. As groups completed their work, they’d enter their raw data onto a giant blackboard chart. Once all data had been entered, multiple cross-checking keeners would total the two long columns of diameter and circumference measurements. We'd then divide the larger circumference average by the smaller diameter average. More than once, I’ve had a class result exactly equal pi to 2 or 3 decimal places; that's always a thrill, even for me. But most importantly, the class would feel they had authentically derived the formula to calculate area of a circle. Also exciting. The active concrete learning experience too an entire period, but it was meaningful in a special way that direct instruction cannot replicate. And there were no lazy students letting the “smart kids” do all the work. But for me as teacher, the real value of that discovery activity was in gathering and lifting those students whose background knowledge had been wanting for whatever reason. They didn’t just learn the "important" lesson goal knowledge, they also learned incidental knowledge that we might categorize as life experience. Some students had never used tape measures before. Some didn’t know that measurement error is most likely with a smaller object. Most had no idea that calculation error will be less disastrous as long as you measure an object consistently, i.e., overestimating (or underestimating) both measurements was better than overestimating one and underestimating the other. The discovery activity made those incidental learnings more personally meaningful, even if those "extras" didn't click until my whole-class lesson consolidation.