I have worked with many museums and most cannot afford the 
barcode/scanning technology. Double counting cannot be avoided unless you 
get the name of each visitor. Therefore a walk-up customer who chooses to 
come again next week is counted twice. 

Same day sales should be fine given you reference the same sale record in 
your admission system. If you are not using an admission system double 
counting may occur.

If you consider the barcode route you want to use a computerized ticketing 
system with access control. You then can scan tickets whenever and 
wherever you want. You can then do in depth tracking and visitation 
analysis. This is rare to nonexistent in museums. The concept of tracking 
a customer by constantly asking for a ticket can be seen as intrusive.

Some museums have considered RFID. The problem is you need an active RFID 
tag and these cost around $10 a tag. Not a disposable technology and it's 
akin to placing dog collar on visitors. I would say most museums are not 
about creating this kind of environment. A passive RFID would require you 
to issue wristband which may work. However, must cultural visitors may 
view the wristband as something you get at a theme park not a museum.

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