Page 83 - E1 Integrated Workbook STUDENT 2018
P. 83

The purpose and management of the technology and information
                                                                                               function



               6.3   Changeover


                                                    Four methods of
                                                 system changeover






                       Direct                Parallel                Pilot                 Phased
                    Appropriate           Appropriate           Appropriate           Appropriate
                    when there is          when the               when the               when the

                    confidence             system has             system can             system can
                    in the new             not been               be operated            be
                      system or is         used                   in different           implemented
                    not a critical         elsewhere or            geographical          in distinct
                    business               it is a critical       regions.                 parts.
                    system.                   business            Cheaper and           Less risky
                    Cheap and             system.                easier to              than direct,
                    convenient            Provides a             control than           spreads cost
                    but high risk.         degree of              parallel and           and gives the
                                           safety but             less risky             organisation
                                           can be more            than direct.           time to
                                           expensive                                     adapt.
                                           and difficult
                                           to reconcile

                                           systems.




                               A post-implementation review should be carried out to establish if
                               the objectives of the new system are being achieved.























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