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Incorporated, a worldwide network of science museums and related institutions.
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Philipe,  hi!

I have a rule of thumb that 10,000 sq. ft. of substantially interactive
exhibition takes 3 people to maintain.  2 - 2.5 of these people have a tool
pack on their belts;  the rest is overhead - management, accounting, design
and fabrication (for those exhibits that are unmaintainable and just must
be changed), graphics (for those graphics which just must be changed) etc.

Many people think that this is a high estimate - but I think that they
haven't added up all the bits.  Most science centers are open 1.6 times a
person-year of 236 days, so quite a few of these maintenance people must be
part-timers.

Good luck!

Peter Anderson

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