Wu, D. Lawless, J. Bisbal, J. Grimson V. Wade and R. Richardson ‘The Butterfly methodology: a Gateway-free approach for migrating legacy information systems’ in 3rd IEEE Conference on Engineering of Complex Computer Systems (ICECCS 97), 8th -12th September, 1997, pp 200-205
The problems posed by mission-critical legacy
systems - e.g., brittleness, inflexibility, isolation, nonextensibility,
lack of openness - are well known, but
practical solutions have been slow to emerge. Generally,
organisations attempt to keep their legacy systems
operational, while developing mechanisms which allow
the legacy systems to interoperate with new, modem
systems which provide additional functionality. The most
mature approach employs gateways to provide this
interoperability. However, gateways introduce
considerable complexity in their attempt to maintain
consistency between the legacy and target systems. This
paper presents an innovative gateway-free approach to
migrating legacy information systems in a missioncritical
environment : the ButtelJly Methodology. The
fundamental premise of this methodology is to question
the need for the parallel operation of the legacy and
target systems during migration.
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