I know that at the Arkansas Air Museum in Fayetteville, Arkansas, our donation rate ran pretty at $.33 a head from month to month. On some very good months, it would climb up to $.50 a head. So you can perhaps use that as one yard stick for one of your measurements. When the local National Historic Site here in Oregon began charging an admission fee ($2.00/head), I know their visitorship levels dropped between 25% and 35%. So perhaps that will give you another yardstick. Here's you might want to consider. A good number of the people you bring into the museum will visit your gift shop and perhaps consider buying a membership while they are in there. If you charge an admission fee, you're cutting this pool of museum gift shoppers and possible members down by at least a quarter. So you'd also want to consider what you might lose in memberships and gift shop income when you're looking at what you might make by charging admission. If the figures are close, perhaps you could bring in the same amount of money by taking a few extra steps to increase your free museum visitorship. Just something to think about. Thomas E. (Pete) Jordon