Advances in technology now allow hotel operators to “remember” every guest's preferences through guest histories. However, few hotels are making use of the mountain of data that hotel guests leave behind.
Dev, C. S., & Ellis, B. D., (1991). Guest histories: An untapped service resource. Cornell Hotel and Restaurant Administration Quarterly, 32(2). 29-37. doi: 10.1016/0010-8804(91)90075-3