The users' perception of the relative worth of a product or service to them. Formally defined as the subjectively weighted difference between the most a buyer would be willing to pay for the product or service, less the actual price of the item. Time user must spend to 'acquire' is often used as a surrogate for 'relative worth or price paid,' in library research. For example, a user might be willing to expend drive time and a brief time in the library to check out a best seller, but not wait two weeks for a copy to be returned.
For more information http://archive.ifla.org/VII/s34/pubs/glossary.htm#A
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