Year 9: Cyber Phronesis

Make thoughtful choices online. Explore privacy, cyberbullying and real survey data through six lessons, with activities and a pupil booklet.

Year 9 · six 70-minute lessons · the Regis lesson structure

Image compression challenge

Choose the smallest image that still does its job. Compare a logo, timetable or photograph, gather evidence and defend your choice.

Year 10 · paired activity · 24 minutes

Lossy Bench

One bitmap, two sliders. Cut the colour palette and watch gradients band; run the same image through a real JPEG encoder and watch 8 × 8 blocks and ringing appear. Genuine file sizes throughout, and the pixel count never changes.

OCR J277 · 1.2.5 Compression