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Year 9 • Lesson 7

Algorithm Watch

How platforms shape what you see — and think

Platforms don't show you reality — they show you a curated version designed to keep you scrolling.

🎯 Learning Objectives

  • Explain how recommendation algorithms work and why they prioritise engagement
  • Identify the psychological techniques platforms use to maintain attention
  • Design modifications to a fictional app that prioritise wellbeing over engagement

📚 Key Vocabulary

Recommendation algorithm
AI that decides what content to show you next to maximise engagement
Engagement
Interactions (clicks, likes, watch time) — what platforms are optimised to maximise
Filter bubble
A state where algorithms show you only content matching your existing views
Variable reward
Unpredictable rewards (like slot machines) that make scrolling addictive
Dark pattern
Design choices that manipulate users into actions against their interest

⏱️ Lesson Timing (50 mins)

🪝
Hook
5 mins

"Why do you watch a 30-second video and then look up 3 hours later?" Students share experiences. Teacher builds towards "this is by design."

👨‍🏫
Teach
12 mins
  • How recommendation algorithms work: watch time, likes, shares, completion rate
  • Why outrage travels fastest: high engagement
  • Variable reward schedule: like pulling a slot machine lever (Skinner)
  • Dark patterns: infinite scroll, autoplay, notification badges, "seen by" indicators
  • Filter bubbles: political, cultural, product echo chambers
  • The business model: your attention is sold to advertisers
  • What platform designers say in private about their own products
🛠️
Create
38 mins

Students are "ethical UX designers" hired by a fictional social media company that wants to redesign for wellbeing. (1) Audit a fictional app's dark patterns using a checklist. (2) Propose 5 specific design changes that reduce manipulation while keeping the app useful. (3) Mockup 2 of the changes as annotated wireframes (PowerPoint Online or paper sketch, photographed). (4) Write a 150-word pitch to the board: why ethical design is also good business.

Tools:
PowerPoint OnlineWord Online
📢
Share
5 mins

Share best design change idea. Class votes: would this actually help? Would people use an app that was less addictive?

🔧 Tools & Resources

🤖 AI Angle

AI is increasingly used to make recommendation algorithms more effective at capturing attention. The people building these systems include AI engineers.

📝 Evidence of Learning

Dark pattern audit + 5 redesign proposals + 2 wireframe mockups + pitch paragraph

📚 Homework

Track your own screen time for 3 days. Note which apps take most of your time and whether that feels intentional. Write a 150-word personal reflection.

⏱️ 20 mins

♿ Differentiation

Support (for students who need help)

Dark pattern checklist with image examples of each type

Extension (for advanced learners)

Research the Digital Services Act (EU) or Online Safety Act (UK) — what rules exist about dark patterns? Are they working?