I try with a few people (ie 3-4), fix what's not working, and repeat. I
keep going until visitors seem to get it. It's not scientific, but it
works, and it's a lot more satisfying than 100 trials of an exhibit that
doesn't work.

>Hi--For those of you who have done formative exhibit evaluations, what
>is considered a sufficient sample when observing visitors interacting
>with a small exhibit with only one "interactive" element (a touch box)?
>100?  200?  Any other thoughts on formative evaluation appreciated (and
>yes, we have the book "Try It" which is on this very topic).  Thanks for
>any feedback!
>
>Stacey Otte
>Collections Manager
>Catalina Island Museum
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Sharyn Horowitz, The Health Museum of Cleveland
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8911 Euclid Avenue
Cleveland, OH 44106
(216) 231-5010
fax 216-231-5129