Cramtrack, the regional commuter train system, is trying to train users of its newly installed computer system. For the users to get the proper training, the systems analysts involved with the project sent a memo to the heads of the four departments that include both primary and secondary users. The memo said in part, "Only people who feel as if they require training need to make reservations for offsite training; all others should learn the system as they work with it on the job." Only three of a possible 42 users signed up. The analysts were satisfied that the memo effectively screened people who needed training from those who did not.