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Incorporated, a worldwide network of science museums and related institutions.
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Neville,

Separate school entrances are great boons for receiving 
and organizing school (and some other) groups.  The only
real negative I can think of was first pointed out to me by 
Verner Johnson (architect):  

We make wonderful entry experiences in our buildings (often!)
and then bring the kids in the back door - aren't they the ones
for which we build the grand entrances?

This struck me as especially valid when I worked at the Museum 
of Science and Industry in Chicago - a wonderful neoclassical
building with great steps rising to a grand pillared entry ( a 1893
World's Fair building).  We brought the kids in the back then, by 
the dumpsters.  It wasn't right!

Good luck!

Peter Anderson

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