1. A system for use in adaptively updating template candidate order sets, comprising: a repository of information comprising a plurality of candidate order sets individually including a plurality of candidate items for order and associated corresponding related order parameters, an individual item for order being associated with a plurality of related order parameters; a data entry monitor for monitoring user selection of candidate items from a candidate order set acquired from said repository and recording candidate item usage data identifying items selected by a user for order from individual particular candidate order sets for a plurality of different candidate order sets; and a data processor for determining from the recorded candidate item usage data parameters comprising at least one of, (a) data indicative of the number or proportion of candidate items of a particular candidate order set that were selected by a user during order entry and (b) data indicative of the number or proportion of candidate items of a particular candidate order set that were not selected by a user during order entry.