Modernizing Legacy IT Systems : Methods, Challenges, and Strategic Insights

Modernising legacy information technology (IT) systems is essential to improving efficiency, maintaining competitive advantage and driving business growth. This article provides an in-depth analysis of different approaches to modernising legacy systems, highlighting the importance of selecting appropriate methods and taking into account the common challenges faced by organisations during these transitions. The goal of this analysis is to compare different approaches to modernisation, identify best practices and offer concrete suggestions for overcoming difficulties. These objectives were achieved using a case study approach, ensuring an in-depth analysis of real-world modernisation projects in a wide range of areas. The research selected was chosen for its relevance, the quality of the data and its ability to provide valuable insights into the challenges of IT modernisation. Although this review was comprehensive, a number of difficulties and limitations were encountered, such as the diversity in scope and depth of existing research, which sometimes made it difficult to make accurate comparisons between each of the methodologies. In addition, specific organisational contexts and rapidly evolving technological landscapes have added additional levels of complexity, limiting the generalisability of the results. Nevertheless, this study provides essential insights and concrete recommendations to support organisations through the complex process of modernising IT systems, enabling them to make informed decisions tailored to their specific needs and situations.