fisheyeview, if you don't want to participate in the study, don't. But don't use the time and effort of the people trying to collect the data by entering material that isn't consistent. This guy's on the up and up; they're trying to do some real research about scuba divers, which is rare because of the lack of funding in general. I think we should try to support them, rather than be difficult. There are easy ways to identify your surveys as yours (to the satisfaction and utility of the researchers) without revealing any information you would prefer to retain as private.