Picture a typical software demonstration. I am at the front, clicking through a configuration. Students are watching the projector, listening to me narrate, reading the text on the screen, and trying to reproduce each step on their own machine. That is four channels of input and one channel of output, all running at the same time, and every one of them is competing for the same limited attention.
Cognitive load research calls this the split-attention effect, and it hurts everyone. But it does not hurt everyone equally. A student with ADHD who loses the thread for eight seconds is now three steps behind with no way back in. A student who processes spoken language a beat slower is always translating what I said a moment ago while I am already saying the next thing. A student with a visual processing difference is squinting at a cluttered slide. By minute ten, a third of the room is quietly lost and too embarrassed to say so.
The fix is to reduce the number of demands competing at any one moment.
First, put the instructions out before class, in an accessible format. A student who has already skimmed the step list walks in knowing the shape of the hour. Some of my students read it on the bus. Some run it through a screen reader. Either way they arrive with a scaffold rather than a blank.
Second, alternate watching and doing. I demonstrate three or four steps while students only watch, hands off the keyboard. Then I stop, and they do those same steps while I walk the room. Then we repeat. Nobody has to watch and type simultaneously, and the walk gives me a real read on who is stuck.
Third, keep a short step list visible the whole time, on a second screen, a whiteboard, or a printed half-sheet. When a student drops the thread, the list is the way back in. It should be terse: numbered, one action per line, no paragraphs.
Fourth, caption everything you record and clean up everything you project. Captions are not only for deaf and hard-of-hearing students; they help the student in a loud house, the second-language learner, and anyone whose auditory attention wanders. Slides with one idea and generous white space get read. Slides with nine bullets get ignored.
Community college labs make this harder than a lecture hall would. Machines vary, students arrive at different points, and there is rarely a teaching assistant to catch the person who fell behind. That is precisely why the structure matters. The alternating rhythm and the visible list are doing the work an assistant would do. Fewer competing demands means more students finishing the lab, and it means I spend the period teaching rather than re-teaching the same three steps to one row at a time.
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