Clustering — for facilitators

Samvinas

• Pipe in the ideas (e.g. from Brainstorm).
• Let the group select and group items; encourage clear names.
• Groups collapse by default — expand to review them.

Clusters are category items; grouped items keep their link back to the original idea, so downstream tools can work with either the themes or the underlying ideas — you can vote on or score whole themes.

Paper and pen

You need: the sticky-note wall from the previous activity, a few stickies in a second colour for group names, and fat markers.

• Start with a few minutes of silent sorting: everyone moves notes so that related ideas sit together. No talking yet — silence stops one voice pre-sorting the wall for the room.
• Then talk: walk the emerging clumps, split or merge where the group disagrees, and leave loners alone — an UNGROUPED corner is fine.
• Name each cluster on a different-coloured sticky placed at its top, so names read at a glance from across the room.
• The failure mode is a "miscellaneous" pile that swallows the wall — if a cluster can't be named, it isn't one yet.
• Harvest: photograph each named cluster close enough to read, then the whole wall. The next activity will want the themes, and the photos keep the detail.

When & why

Reach for Clustering when the list has grown past what the group can hold in mind — it arranges without cutting, so nothing is lost while the shape emerges.

Clustering organises the field; it doesn't choose from it. If you want the group to choose, follow it with a focusing tool — see convergence.

• Clustering is social, and a few people often lead. Invite quieter voices to propose groupings.
• Don't over-cluster — 4–7 themes is usually more useful than fifteen.
• Restate each cluster before moving on. A name that does something — a verb phrase ("pilot the scheme with two teams"), or a fresh "How might we…?" if you're clarifying — turns a pile into a proposal. One-word labels waste the work the group just did.
• What usually follows: Voting or Ranking to converge on themes, or Value / Doability to weigh them.