By Sayef Khan
“Our goal isn’t to dumb down - it’s to make thinking easier to direct”
How long can we realistically expect our students to concentrate in a world of constant notifications, scrolling feeds, and endless digital distractions?
Attention spans are often described as shrinking, but what we see in classrooms is not a lack of ability to think; it is a struggle to focus when too much competes for limited working memory. This is where Cognitive Load Theory becomes so powerful in shaping effective teaching. Originally developed by John Sweller, Cognitive Load Theory reminds us that working memory is limited. When students are presented with too much information, confusing instructions, or cluttered materials, their mental resources become overwhelmed.
Last term, the Business and Enterprise department paused to reflect on a deceptively simple question: How much content are we actually putting on our lesson slides? What began as a routine discussion quickly became a moment of honest professional reflection. When we looked carefully at our curriculum materials, it became clear that many of our slides were carrying far more information than our students’ working memories could realistically manage. In our effort to be thorough, we had unintentionally made thinking harder to direct.
This realisation brought us back to John Sweller’s Cognitive Load Theory and, in particular, the concept of reducing extraneous load. Extraneous load refers to the unnecessary mental effort caused not by the complexity of the subject itself, but by the way information is presented. Dense text, multiple fonts, unclear instructions, excessive bullet points, and cluttered visuals all compete for attention. Instead of focusing on analysing a balance sheet or evaluating a marketing strategy, students are first forced to decode the slide in front of them. Have a look at an example below:
What’s the difference between the before and after slide?
Clearer layout and spacing – text is less crowded and easier to read
Simpler design – removes unnecessary images (e.g. video thumbnail, van photo)
More focused visuals – single burger icon supports the context clearly
Improved heading structure – “Think/Write/Pair/Share” is clearly separated
Better emphasis – key words (Aim, Objective, Activities, Task) stand out more
More concise wording – less clutter makes the task clearer
When students understand what they are being asked to do, they are more likely to participate, take ownership of their learning, and experience success.
Reducing extraneous load is especially impactful for SEND students. Many learners with additional needs can be disproportionately affected by cluttered visuals, lengthy instructions, or poorly structured tasks. Simplified layouts, chunked information, consistent formatting, and clear modelling reduce cognitive overload and support processing. These adjustments are not “extra support” for a few; they are inclusive strategies that improve accessibility for all learners.
Ultimately, reducing extraneous load is not about making lessons look simpler; it is about making learning more powerful. When we remove distractions and present information with clarity and purpose, we give every student, regardless of ability, the cognitive space to think, understand, and thrive.
So next time you are planning a lesson, pause and ask yourself: Is this helping students think about the content, or is it making them work hard just to access it?
Further reading:
https://set.et-foundation.co.uk/resources/the-importance-of-cognitive-load-theory
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