[Revisiting legacy systems and legacy modernization from the industrial perspective]
Throughout many years of systems engineering development, a plethora of research has been conducted in an academia regarding legacy systems and legacy modernization. Their works have been resulted in papers, journals, and other products. According to some authors, legacy systems can be defined as a complex and critical system that work well, although it was developed with an outdated technology (software and hardware). They resist of modification and evolution, difficult to understand, and there is scarcity of experts/knowledge, and are inflexible towards new business requirements.
The study revealed that the legacy systems are not merely about IT, but also involve business and organization aspect. Academies tend to see the legacy systems from a technical point of view which leads to bad impression of the systems. However, professional in the industry see the legacy system more from the business value of the system. Consequently, problems from the technical side of the legacy systems are not really the problems for professionals in industry unless the problems disturb their business process.