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We've tried both and AND seems to be what people expect. You may be able to get by using OR if the results are ranked and those satisfying the AND test are placed before the OR results. --Th -----Original Message----- From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Ross Singer Sent: Wednesday, November 24, 2004 9:22 AM To: [log in to unmask] Subject: [CODE4LIB] Default boolean for search engine What do you think is more appropriate (and intuitive) for a search engine if the user gives no boolean, "and" or "or"? I guess my question is, assuming it's a keyword search, and the user types in "institute paper science", would it be more appropriate to default to "institute AND paper AND science" or "institute OR paper OR science". I'm just sort of curious what other people's take on this might be. Thanks, -Ross.