There is no silver bullet method for legacy modernization. The best approach obviously depends on the problem that need to be solved. But before solving it, the problem must be clearly identified. Gartner defines 𝘀𝗶𝘅 𝗺𝗮𝗶𝗻 𝗱𝗿𝗶𝘃𝗲𝗿𝘀 𝗳𝗼𝗿 𝗲𝘃𝗮𝗹𝘂𝗮𝘁𝗶𝗻𝗴 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗺𝗼𝗱𝗲𝗿𝗻𝗶𝘇𝗮𝘁𝗶𝗼𝗻.
The first three of these drivers code from business perspective: 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗳𝗶𝘁, 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝘃𝗮𝗹𝘂𝗲 and 𝗮𝗴𝗶𝗹𝗶𝘁𝘆 – meaning that if the legacy application is not meeting the new requirements imposed by digital business, it needs to be modernized to fit properly and should be upgraded to provide greater business value. Applications that lack the agility to keep pace with the demands of digital business may be a cost or risk liability.
The three other drivers come from the IT perspective, and involve 𝐜𝐨𝐬𝐭, 𝐜𝐨𝐦𝐩𝐥𝐞𝐱𝐢𝐭𝐲 and 𝐫𝐢𝐬𝐤. If the total cost of ownership is too high, the technology too complex, or security, compliance, support or scalability are being compromised, it’s time to modernize.
𝗧𝗵𝗲 𝗯𝗲𝘀𝘁 𝗺𝗼𝗱𝗲𝗿𝗻𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝗼𝗽𝗽𝗼𝗿𝘁𝘂𝗻𝗶𝘁𝗶𝗲𝘀 𝗮𝗿𝗲 𝘁𝗵𝗼𝘀𝗲 𝘄𝗶𝘁𝗵 𝗺𝘂𝗹𝘁𝗶𝗽𝗹𝗲 𝗱𝗿𝗶𝘃𝗲𝗿𝘀 𝗳𝗿𝗼𝗺 𝗯𝗼𝘁𝗵 𝗮 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗮𝗻𝗱 𝗮𝗻 𝗜𝗧 𝗽𝗲𝗿𝘀𝗽𝗲𝗰𝘁𝗶𝘃𝗲.