Mark Matlock and I have done 2000, 2500, and something in between those two - in a series of three events (youth ministry conferences) across the US.
And I've done several other large-scale OS events.
The process still delivers intimate conversation, and the process does not change.

As for any sized group - it works if it's the right tool for the job (objective, time available, space available, context of what comes before and after, and all the other things one typically talks about with a client while assessing if Open Space is the answer) - and the larger the group, the more thoughtfulness is necessary (I find) to ensure clear sound, safety / access issues, ability for a participant to easily navigate around a room / see where they need to go, and so on.

Dan - are you asking because you wish to write something in a book - or because you are planning something with a client?

I look forward to hearing everyone else's thoughts, experiences and observations...

Lisa


Lisa Heft
Consultant, Facilitator, Educator
Fellow, Columbia University Center for International Conflict Resolution
Opening Space
[email protected]

Ask me about these 2011 workshops for facilitators and others who convene people:
 - The Power of Pre-Work - August 24-26 - San Francisco, USA
 - The Open Space Learning Workshop
       - October 17-18- Santiago, Chile (en espaƱol)
       - December 14-16 - San Francisco, USA



On Aug 15, 2011, at 6:25 PM, Dan Mezick wrote:

First of all, thanks to each of you for sharing your knowledge of OST.

Now for my questions.

1. I wonder what the practical limit is on attendance at a single OST event. I wonder if 2000~ is the effective upper limit. I wonder if an event with, say, 4000 people is actually practical, assuming that many folks might like to attend.

2. I wonder -- what the largest OST event ever convened on the planet.

Thank you for your help!

Dan


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