Systematic Review of Legacy System Migration

Legacy systems are business-critical systems that have been developed over the past decades. These systems are inflexible and have many issues. Therefore, they need to be modernised and migrated into new technological environments to reduce costs and to improve flexibility. Thus, a systematic review is conducted in this paper to consider legacy system modernisation strategies, which range from simple wrapping to full migration. The quality aspects of the migration process need to be considered when selecting a moderation strategy to satisfy the migration requirements. Therefore, this paper proposes the integration of quality into migration processes, which has a considerable impact on cost and risk.