---
title: "EventStorming: One (co-)facilitator for every 15 participants"
source: "https://virtualddd.com/heuristics/eventstorming-one-facilitator-for-every-15-participants/"
authors: ["Tobias Goeschel"]
tags: ["collaborative modelling", "eventstorming", "sociotechnical systems", "collaborative software design", "psychological safety"]
type: "guiding heuristics"
question: "How many conversations can a single facilitator keep track of?"
submitter: "Tobias Goeschel"
---

# EventStorming: One (co-)facilitator for every 15 participants

For a Big Picture EventStorming, we can have around 20-30+ people per wall - but even an experienced facilitator will have a hard time noticing subtleties, body language and tonal nuances when more than 2-3 conversations are going on at the same time. Limit the group size per facilitator to ~15. For larger groups, it is advisable to add co-facilitators to help with the things happening behind your back.

## Examples

1. Doing a Big Picture EventStorming.

2. A co-facilitator should be present for every group of 15 participants.

3. The workshop agenda and general workings should be guided by the main facilitator.

## Context

Setting up for a Big Picture EventStorming session