The complexity attachment in modernization journey

Often referred to as heritage systems, Legacy systems have proven their efficacy and durability over the decades but struggling to prove their viability in the digital market. Legacy systems are being modernized and migrated with a complexity that increases the cost and risk in those journeys. Their underlying characteristics require an in-depth assessment of the factors contributing to their complexity. Therefore, this paper proposes a systematic review to trace and analyze the emergence of characteristics leading to complexity attachment and associated factors and illustrate different techniques to assess factors.