• Sticky notes (many per student)
• Large chart paper or whiteboard
• Markers for category labels
• Timer

Gather many sticky notes (different colors optional). Clear wall or table space for grouping. Prepare open-ended prompt. Plan groupings for collaborative phase.

1. Explain affinity mapping: Generate lots of ideas, then find patterns by grouping.
2. Focus question: 'What are issues facing our community that students could help address?'
3. Silent brainstorm (7 min): Write ONE idea per sticky note. Generate as many as possible.
4. Rules: No talking during brainstorm. Quantity matters - aim for at least 10 sticky notes.
5. All ideas valid - no judgment yet.
6. When time's up, everyone posts sticky notes on the wall/board. No organizing yet.
7. Read silently: Walk around, read all ideas.
8. Silent grouping (10 min): Start moving sticky notes into groups of similar ideas. Anyone can move any note. No talking.
9. If you disagree with a placement, move it. Notes might move multiple times - that's okay.
10. Create category labels: Once groups stabilize, collaboratively name each category.
11. Discuss: What categories emerged? What patterns do you notice? What surprised you?

Scribe for students who struggle with writing. Provide idea starters on sample sticky notes. For advanced students, require subcategories within main groupings.

Evaluate idea quantity and quality. Check that categories emerge from ideas rather than being predetermined. Note discussion quality during grouping. Assess whether final categories are logical.